|This article is about a/an rider in Kamen Rider Kabuto.|
Arata Kagami (加賀美 新 Kagami Arata) is Kamen Rider Gatack (仮面ライダーガタック Kamen Raidā Gatakku, Masked Rider Gatack), one of the main protagonists of Kamen Rider Kabuto. He was previously the second user to become Kamen Rider TheBee (仮面ライダーザビー Kamen Raidā ZaBī, Masked Rider TheBee), but later decided to not fight Kabuto and gave up TheBee Zecter.
- 1 History
- 2 Post Series and other events
- 3 Appearances in other media
- 3.1 Kamen Rider Decade: All Riders Super Spin-off
- 3.2 OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~
- 4 Video Game appearances
- 4.1 Kamen Rider Kabuto video game
- 4.2 All Kamen Rider: Rider Generation 2
- 4.3 Kamen Rider Battle Ganbaride
- 4.4 Kamen Rider: Battride War series
- 4.5 Kamen Rider Riderbout
- 4.6 Battle Spirits
- 4.7 Kamen Rider Batton-Line
- 4.8 Kamen Rider City Wars
- 5 Personality
- 6 Abilities
- 7 Forms
- 8 Equipment
- 9 Legend Rider Devices
- 10 Family
- 11 Relationships
- 12 Behind the scenes
- 13 Notes
- 14 Appearances
- 15 References
He started out a low-level field agent of ZECT who's responsible for filming battles. He also works with Hiyori at Bistro La Salle. He has a good heart but is hot-blooded and will often act without thinking about the repercussions of his actions. During the first episode, Kagami attempted to become Kabuto with a Rider Belt but failed as the Kabuto Zecter had chosen Tendo. He joined ZECT in order to avenge his younger brother who was killed by Worms.
He was later confronted by Bellcricetus Worm, the Worm that had killed and mimicked his brother, Kagami could not bring himself to kill the Worm as he thought it would be killing the last remnants of his brother. Kabuto would also not kill the Worm until Kagami made the choice to allow him to kill the Worm. Kagami was later chosen by the TheBee Zecter to become Kamen Rider TheBee after it rejected the previous user, So Yaguruma, and reacted to his desperation to protect the wounded Shadow members. Arata, however, gave up his role as TheBee after he was torn between the orders of ZECT to eliminate Kabuto and his budding friendship towards Tendo.
He later realized that Soji did not want a friendship with him—after accepting this fact and renewing his pledge to destroy all Worms, Tendo let him back into his life. He was later framed by Shun Kageyama as being a traitor to ZECT, but this was simply to lure the real traitor out. He would have died if Tendo had not saved him. This incident ignites Kagami's will to destroy Worms on his own.
Although he is given a chance to test the Gatack Zecter, he was attacked by it when it rejected him. When Kagami goes to rescue the young boy Makoto, whom he met in the warehouse, Makoto's true form is revealed to be Tarantes Worm, who kills Arata and leaves quickly. After the Worm leaves, a mystery man appears and equips Kagami's lifeless body with a Zecter belt. Kagami then revives due to the capability of the ZECT belt's energy field. Later, Kagami calls upon the Gatack Zecter and goes on to fight the Tarantes Worm only to be saved by him in the end by shielding him from the explosion detonated by the Shadow Troopers. This convinces him that Worms have a humane side to them; but is mocked when Kabuto tells him he's "naive as usual." Gatack tells Kabuto that he is who he is and nothing can change that. His design looks similar to Kabuto's except he has mandible horns and is colored blue with red eyes. The voice of Gatack Zecter differs from the other Zecters. He decides to work together with Misaki and Tadokoro to find out the truth of the Masked Rider Project after he confronted Mishima.
During a battle, Kagami discovered the true identity of Tsurugi Kamishiro (Kamen Rider Sasword). After seeing Tsurugi's devotion to avenge his sister, Arata decided to protect Tsurugi. This eventually caused a fight between Gatack and Kabuto to prevent Kabuto from killing Tsurugi. After this, Arata and Tendo witnessed the transformation of Hiyori to a Worm. Despite her being a Worm, Arata works together with Tendo to protect her. But their results end in failure as Hiyori disappears with the man in the iron mask. This incident leads Soji into joining ZECT in order to destroy it from within and also starts collecting Zecters. Arata does not believe in Tendo's method of collecting all the Zecters so he can save Hiyori. This eventually sparks a furious fight between Gatack and Kabuto, which Gatack ends up losing. Tendo wants Kagami to give up the Gatack Zecter but Kagami refuses, stating that Riders are meant to protect humans. Arata is seemingly destroyed by Cammarus Worm in episode 34, but he is saved when Hyper Kabuto uses the Hyper Zecter, although unsure of its function, to reverse the flow of time and save his life. Even after this Soji still told Arata that they will fight one day to finish things.
Kagami is told by the ZECT HQ to protect Daigo Tachikawa at first, but Arata soon discovers he is a Worm, but realizes then he realizes again that Daigo is not a Worm that destroys humans. Arata later finds Daigo again, this time taking him to Tsurugi's house to heal him. However, after the short confrontation, Daigo realizes Tsurugi is a Worm and uses the Sasword Zecter to escape from him. Arata was referred to by Tachikawa as "Arata Kagami, the one chosen by the god of battle". This was also shown in the report found at Area X. During the battle with Cochlea Worm, Kabuto’s Red Shoes System activates, which leaves Gatack alone to try and stop him. Ultimately succeeding, they are attacked by the Hopper Riders shortly after and are defeated horribly. In the end however, Arata and Soji make a promise with each other, if Soji goes berserk again and tries to kill Hiyori, Kagami will kill him, vice versa. Soji also no longer wants to own the Gatack Zecter, for no one would be able to stop him if Arata were to ever disappear.
Arata's suspicions about ZECT begin to grow during episode 41 when they unknowingly escort a group of Natives. When they are attacked by a group of Salis Worms, the Natives attempt to escape, referring to Gatack as "The Top's son". Confused, he is the first one to meet Reiji Nogi, the executive class Worm that was able to defeat him in one attack. Arata then goes to his father, and he tells him the origin of ZECT. Arata discovers that the Natives came to Earth 35 years ago and made an agreement to help create the Masked Rider System. In turn, ZECT would help protect the Natives against the Worms that would arrive later. His father tells him that his soul now belongs to the Natives, and Arata needs to be the one to carry it on. After hearing this, Arata begins to fear that his sole existence is to be the catalyst for defeating Worms. Arata's faith is further shattered when he discovers Tadakoro is a Native, thanks to the accidental exposure of AMB (Anti Mimic Bomb) gas. Shocked and dismayed, Arata continues to wonder about why Tadokoro hid this secret, and so he is unable to fight.
In turn, he is defeated by both some Salis Worms and Nogi in a matter of minutes. Arata is eventually led off by Misaki, but he is still angry at Tadakoro for hiding the fact that he is a Native. During episode 42, Arata is chosen as the negotiator to rescue the Natives. Nogi has demanded that ZECT give up their last AMB and they will release the Natives, along with Tadakoro. Arata, still angry at ZECT refuses and even gives up his Gatack Buckle. However, after Soji talks to him, he realizes that his father wanted him to save the Natives, but at the time keeping the AMB. Realizing that he needs to catch his father's feelings, Arata goes and meets Mishima, taking the AMB from him . Through trick and trap, they are able to rescue the Natives and protect the AMB, although Arata is once again defeated by Nogi. Soji arrives on the scene and displays his new power as he uses the Perfect Zecter Gun Mode to defeat Cassis Worm Dimidius.
After patching things up with Tadokoro, Arata once again has a brighter outlook on life. While playing again at the baseball field, Arata meets his father again, who shows that he does indeed love Arata and plays catch with him. In turn, Arata is finally able to accept his father's feelings. Soon after, Arata meets Cassis Worm Gladius in battle, and his Rider Kick attack goes horribly wrong, with the kick being returned against Arata. It is later discovered that Gladius and his Worm army are planning to assault Area Z, the place where the original Masked Rider System was created.
After leaving the Hospital, Arata discovers that Soji is planning to lose to Dark Kabuto in order to find Hiyori's whereabouts, and immediately finds Tendo, shouting the sense back into him. Despite this, Soji states that he cannot fight for Hiyori anymore, as she is happier with the fake. Arata however, believes that Hiyori is trying to protect Soji, and tells him that he needs to go after her. After Soji leaves for Hiyori's world, Arata goes on to fight Cassis Worm. He meets Shun who has once again become TheBee, but their attacks fail, and Nogi defeats them once more. Arata is able to return to the battle before Tadokoro detonated Area Z. Gatack, KickHopper, and Kabuto then execute a three-way Rider Kick, effectively neutralizing Cassis Worm who was then destroyed by Hyper Kabuto.
Gatack is called upon to fight the Worms that are constantly appearing, but he is sidetracked after discovering that Misaki has agreed to Tsurugi's request for a date. Unwilling to tell her that Tsurugi is a Worm, he follows them on their date, only to discover that Tsurugi does indeed lose control, forcing Arata to save Misaki.
Despite this, both Tsurugi and Misaki end up being completely infuriated at Arata. Misaki is astonished that Arata knew all along Tsurugi was a Worm, but never told her. Tsurugi is mad at Arata for similar reasons, that even though Arata knew all this, he never told him. Arata finally tells Soji of Tsurugi's true identity later, but still believes that he isn't entirely evil. Soji on the other hand, decides to defeat him, as with all other Worms. After rushing off to meet Clipeus once again, Scorpio Worm rises from the sea and assaults Arata. Arata, unwilling to fight his friend, gets defeated. Meeting Tsurugi again, Arata tries to convince him to live as a human again, handing him Misaki's present. However, Tsurugi punches Arata out instead, and takes the Gatack Zecter. Kidnapping Arata, Tsurugi attempts to destroy all the Zecters, but fails as Arata and Soji are able to regain their Zecters. While Soji goes to fight Scorpio Worm, Arata takes on one of the Clipeuses, effectively defeating him with a Rider Kick.
Arata's father Riku has finally announced to the world, saying that the Worm threat is finally over. Arata is given the task of delivering the necklaces that can warn humans when a Worm is near. However, he meets conflict in Soji when Soji states that there is something desperately wrong with the device. After multiple conflicts, Arata is finally able to confront Soji, but Soji escapes, and only leaves an injured Renge behind. This leaves Arata, Todokoro, and Misaki even more furious at Soji for his unexplainable actions. Later on, Arata encounters Soji once more and demands to know his reasons for destroying the necklaces. Soji states that they are turning humans into Natives; not believing this, Arata and Soji do battle. With the help of the ZECTroopers, Kabuto is defeated. After defeating Kabuto, Arata receives a call from Misaki, telling him that Mishima has taken over ZECT. Arata then goes to rescue his father, who tells him that no matter what, he must believe Kabuto and fight alongside him.
During the final stage, Arata finally realizes that the necklaces, along with Mishima's broadcast signals, are changing humans into Natives. After knowing Mishima's evil plot, Misaki and Tadokoro aided him. Arata confronted Mishima and Negishi, only to be defeated by Mishima and is almost killed, until Soji arrives at the scene. Arata realizes that they are the only ones who can save the world now, and must do it no matter what. Together with Hyper Kabuto, they are able to destroy Mishima, thus ensuring the safety of the world. Within his last moments, Mishima collides with the meteorite, setting off an explosion and ruining their entire operation.
After realizing the battle is over, he removes the Gatack Zecter, letting it go, and watches it fly away with the Kabuto Zecter to an unknown destination. Arata then falls to the ground with exhaustion, and as he smiles, he realized that the battle is finally over. After hearing Soji`s words and finishing it for him, Tadokoro, Misaki, and Renge arrive. Misaki gives a hug to Arata. Renge does the same to Soji, giving both people great surprise. Tadokoro stands to the side and smiles in victory.
During the epilogue, it is shown that Arata now lives a normal life as a police man, with his father still watching over him. As he is crossing children across the street, a young girl asks him, "Where did the man who walks Heaven's Path go?" Arata smiles and replies that Soji is currently out buying tofu. Arata then looks to Soji's house which he and the girl are standing in front of them at the sky in wonder.
Post Series and other events
Kamen Rider Decade
Kamen Rider Gatack appears with other Kamen Riders commanded by Wataru Kurenai piloting Gatack Extender, but all are murdered by Decade in the episode 1 of Kamen Rider Decade in the dream of Natsumi Hikari. The dream concludes with Decade as the only Rider in the Rider War.
The Destroyer of Worlds
In the special version of episode 31, Kamen Rider Gatack is seen as one of the many Kamen Riders who fought in the Rider War against Decade and were all destroyed. They were presumably restored after the destruction (and subsequent revival) of Decade at the end of the Rider War and the worlds were restored.
10th Anniversary Project: Masked Rider LIVE & SHOW
Kamen Rider Gatack appears when summoned alongside other secondary Kamen Riders participating in the musical of Kamen Rider Diend with hats and dancing.
OOO, Den-O, All Riders: Let's Go Kamen Riders
Kamen Rider Gatack was part of a group of reinforcement riders led by Akira Date/Kamen Rider Birth to aid the primary riders in defeating the Rock Great Leader. All the Kamen Riders got on their bikes and performed the All Rider Break attack which destroyed the Great Leader.
Kamen Rider × Super Sentai: Super Hero Taisen
Chou Super Hero Taisen
Kamen Rider Heisei Generations FOREVER
Kamen Rider Gatack appears as a toy. When Sento Kiryu and Sougo Tokiwa find Ataru Hisanagahe, he brings them to his room which is filled with Kamen Rider memorabilia, with Sougo and Sento stunned to see toys of themselves. Ataru reveals that Kamen Riders are fictional.
Appearances in other media
Kamen Rider Decade: All Riders Super Spin-off
Test! The Rider Look-Alikes!!
Kamen Rider G3, Gatack, and Den-O Rod Form appear when Kenichi Suzumura and Narutaki made a question to Tsukasa, Daiki, Yuusuke, and Natsumi about the motif the Riders are very identical to. Kenichi and Narutaki explained that the motif is very similar but not identical.
OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~
Type2. - Peppers! You are Kamen Rider 4!?
Kamen Rider Gatack appears with Faiz Axel Form, Psyga, and J. According to Momotaros, Gatack is considered a perfect boyfriend.
Type29. - Get it! The Stone of the King!
Kamen Rider Gatack appears with Chalice Wild Form, V3, and OOO Tajadol Combo. According to Kivat-Bat the 3rd, Gatack is considered an ideal choice for a marriage.
Type31. - Ice Pop! The Sturdy Really Overslices the Soft!
Kamen Rider Gatack appears with Ouja, Agito Flare Form, and J. According to Kivat-Bat the 3rd, Gatack is considered an ideal choice for a marriage.
Video Game appearances
Kamen Rider Kabuto video game
Kagami appears as Kamen Rider Gatack and Kamen Rider TheBee, sharing his Rider power with Yaguruma and Kageyama. His Hyper form also available but his only finisher is the Hyper Kick.
All Kamen Rider: Rider Generation 2
Kamen Rider Gatack appears in All Kamen Rider: Rider Generation 2 as an unlockable character.
Kamen Rider Battle Ganbaride
Kamen Rider Gatack appears as a playable character in the video game Kamen Rider Battle Ganbaride.
Kamen Rider: Battride War series
Kamen Rider Gatack appears as a Second Rider in the video game Kamen Rider: Battride War.
Kamen Rider Gatack reappears in Kamen Rider: Battride War II.
Kamen Rider Gatack reappeared in Kamen Rider: Battride War Genesis.
Kamen Rider Riderbout
Kamen Rider Gatack Masked and Rider form appears as a playable character with the other Heisei and Showa Kamen Riders in Kamen Rider Riderbout.
Kamen Rider Gatack Masked, Rider, and Hyper Form appears with other Kamen Riders and Monsters in Battle Spirits.
Kamen Rider Batton-Line
Kamen Rider Gatack appears as a playable character in Kamen Rider Batton-Line among other Riders in the game.
Kamen Rider City Wars
Kamen Rider Gatack and his Hyper Form are a playable character alongside the other Kamen Riders in Kamen Rider City Wars.
Arata is rash and hotheaded, as shown when he takes the Kabuto bike to fight against Worms only for it to be taken away by Tendo and nearly gets himself killed for trying to use the Gatack Zecter. He easily gets annoyed, mostly because of Tendo's personality or when ZECT HQ gives absurd orders for him and his team. In addition, he is also quite naive, as he easily believes in the fact the mimicked Ryo (his younger brother who goes missing two years before but suddenly returns) and Makoto (a boy who is trapped in an abandoned factory full of Worms) are not Worms but real people. As a result, he nearly gets himself killed by Worms on more than one occasion. However, in Makoto's case, his belief may not be without merit, as the Worm actually does shield him and protect him from an explosion.
Aside from that, Arata is essentially a good-natured person at heart, always willing to try his best to save people from the terror caused by Worms. He is amiable and supportive to all his friends, especially Tendo and Hiyori, and will never hesitate to help them once the need arises. In fact, the reason why he wants to become a Kamen Rider is to defeat all Worms that threaten humanity and to avenge his brother Ryo. When he does become a Kamen Rider, he takes his duty very seriously, proving himself to be a valuable asset and ally to the protagonists.
Another trait of Arata's is his determination. During the time period when he's rejected by the Kabuto Zecter, he never backs down on his duty to fight and kill the Worms. Even though he is outperformed (for a while) by the other characters, he is still more than willing to take up arms on his own to fight and protect humanity.
- Skilled Combatant: Despite being only a field agent, he frequently takes on Worms while being armed only with his standard-issue collapsible pistol. It is interesting to note that he is the first ZECT Agent to kill a Worm on his own by impaling it with the retractable bayonet of a Machine Bladegun on one occasion. When fighting as a Kamen Rider, Kagami's fighting style largely involves brawler-type moves, frequently tackling his enemies and opting for rapid punches and kicks. As Gatack, his fighting prowess becomes more and more refined as the series progress, becoming a formidable foe to any Worm that he comes across. He makes full use of his Gatack Vulcan and Double Calibur in battle, shooting and slicing Worms in quick succession. This, combined with ClockUp, allows him to defeat swarms low-class Worms with little to no effort at all.
Kagami was the second user chosen by TheBee Zecter to become Kamen Rider TheBee. Later, he was chosen by Gatack Zecter and became Kamen Rider Gatack.
- ―Transformation announcement[src]
- Punching Power: 8 t.
- Lifting Power: 25 t.
- Kicking Power: 9 t.
- Maximum Jump Height: 21 m.
- Maximum Running Speed: 100 m. per 8.6 sec.
Masked Form (マスクドフォーム Masukudo Fōmu) is TheBee's strong, heavily armored, but less offensive form resembling a beehive. This is the default form until the rider rotates TheBee Zecter around the wrist to initiate the Cast Off command.
- "Cast Off! Change Wasp!"
- ―Transformation announcement[src]
- Eyesight: 2 km.
- Punching Power: 3 t.
- Kicking Power: 6 t.
- Maximum Jump Height: 39 m.
- Maximum Running Speed: 100 m. per 5.6 sec.
- Rider Sting: 17 t.
Rider Form (ライダーフォーム Raidā Fōmu) is TheBee's sleeker, faster, and more offensive form which morely resembles the wasp motif. In this form, TheBee can initiate the Clock Up command to travel at near-light speeds match the speed of Worms. By pressing a button on TheBee Zecter, the Rider Sting (ライダースティング Raidā Sutingu) tachyon-powered punch is activated, allowing the user to pierce through a Worm with the stinger on the TheBee Zecter.
- ―Transformation announcement[src]
- Punching Power: 8 t.
- Lifting Power: 25 t.
- Kicking Power: 9 t.
- Maximum Jump Height: 19 m.
- Maximum Running Speed: 100 m. per 8.9 sec.
Masked Form (マスクドフォーム Masukudo Fōmu) is a heavily armored form resembling a pupa. This is Gatack's default form, armed with the Gatack Vulcan (ガタックバルカン Gatakku Barukan) to mow down any Worm unfortunate to stray in Gatack's line of sight in a hail of bullets specialized to kill Worms, until he opens up the horns on the Gatack Zecter, like a switch, to initiate the Cast Off (キャストオフ Kyasuto Ofu) command.
- "Cast Off! Change Stag Beetle!"
- ―Transformation announcement[src]
- Punching Power: 3 t.
- Kicking Power: 7 t.
- Maximum Jump Height: 36 m.
- Maximum Running Speed: 100 m. per 5.8 sec.
- Rider Kick: 19 t.
Rider Form (ライダーフォーム Raidā Fōmu) is the sleeker, faster, and more offensive form that closely resembles the stag beetle motif. In this form, Gatack has access to the Clock Up (クロックアップ Kurokku Appu) command which allows Gatack to travel at near-light speeds to match the speeds of the Worms. By pressing a button three times on the belt in succession, Gatack can perform his tachyon-powered Rider Kick (ライダーキック Raidā Kikku), a jumping roundhouse kick. Gatack also has a Rider Cutting (ライダーカッティング Raidā Kattingu) attack, where he takes the Gatack Double Calibur (ガタックダブルカリバー Gatakku Daburu Karibā) and uses them to perform a scissor-like cutting attack.
Appearances: Kabuto Episode 22-49, Decade Episodes 1 , 31 (Special Version only) , OOO, Den-O, All Riders: Let's Go Kamen Riders, Super Hero Taisen, Chou Super Hero Taisen,Kamen Rider Heisei Generations FOREVER (as a toy).
- "Hyper Cast Off! Change Hyper Stag Beetle!"
- ―Transformation announcement[src]
- Punching Power: 10 t.
- Kicking Power: 15 t.
- Maximum Jump Height: 49 m.
- Maximum Running Speed: 100 m. per 4.2 sec.
- Hyper Rider Kick: 30 t.
Gatack's Hyper Form (ハイパーフォーム Haipā Fōmu) was only seen in the Kamen Rider Kabuto Hyper Battle DVD Birth of Hyper Gatack. This form is capable of performing Hyper Clock Up to move at a greater speed than the regular Clock Up that even races through time and also allows Hyper Gatack to perform the Hyper Kick attack when his Rider Power is brought to the maximum, same as Kabuto's Hyper Form. This form also has a stronger version of Rider Cutting (ライダーカッティング Raidā Kattingu) attack, where he takes the Gatack Double Calibur (ガタックダブルカリバー Gatakku Daburu Karibā) and uses them to perform an energy projection of mandibles cutting attack. This finishing move first appearance in Kamen Rider City Wars.
The only differences between his Rider and Hyper Forms in looks, is a bigger chestplate and larger Stag Beetle Horns on his helmet. When he activates Hyper Clock Up, his chest plate color turns from red to yellow.
Hyper Gatack also appears in the Kamen Rider Kabuto PS2 video game.
This form is exclusive to Birth! Gatack Hyper Form!!
- Gatack Zecter - Transformation device for Gatack
- Rider Belt - Transformation Belt for Gatack
- TheBee Zecter - Transformation device for TheBee
- Rider Brace - Transformation Brace for TheBee
- Hyper Zecter - Transformation device for Gatack to become Hyper Form.
- Gatack Vulcan - Gatack's personal weapons in Masked Form
- Gatack Double Calibur - Gatack's personal weapons in Rider Form
Legend Rider Devices
- "Kamen Ride: Gatack"
- ―DX NeoDiendriver summoning announcement[src]
KamenRide: Gatack: A Rider Card containing the power of Kamen Rider Gatack. Used by Diend to summon Kamen Rider Gatack.
This Rider Ring which bears the likeness of Kamen Rider Gatack is exclusive to Kamen Rider Wizard's Wizard Ring toyline. When used by a Wizardriver wearer, it would be able to summon Kamen Rider Gatack.
- "(Digital beeping) Gatack!"
- ―Activation announcement[src]
- "Armor Time! (electronic beat mixed with Gatack Zecter post-Rider Form noises) Stag Beetle! Gatack!"
- ―Rider Armor transformation announcement[src]
- "Finish Time! Clock Time (Break/Burst/Jack)!"
- ―Rider Armor finisher announcement[src]
Gatack Ridewatch (ガタックライドウォッチ Gatakku Raidowotchi): Based on Kamen Rider Gatack, this Ridewatch would provide access to the GatackArmor. It is dated 2006.
- Soji Tendo: At first, he considers Soji a weird person and gets annoyed by his personality but later wants to befriend him. Although their relationship has a rather rocky start in the beginning due to their differences, they eventually become great friends, with Tendo even noting that their bond is unbreakable during their fight with Cassis Worm. The two share a mutual trust and dependence on each other. Tendo helps Arata when he's in doubt, and Arata convinces him to fight Dark Kabuto instead of giving up. On a side note, Tendo believes that Arata should be the one to defeat him if the Red Shoes System makes him go out of control.
- Yuzuki Misaki: Yuzuki is the most trusted ally on his team. Like Tendo, she is also usually shown giving Arata advice when he is in a dilemma.
- Syuichi Tadokoro: Arata's superior who cares greatly about his subordinates. Arata looks up to him, but he loses all of his respect when it is revealed Shuichi is a Native. However, they are able to set aside this difference eventually and become good partners again
- Hiyori Kusakabe: Arata's coworker at the Bistro La Salle. The two share a close relationship. In the movie's timeline, it is revealed that he is in love with her.
- Jyuka Tendo: He befriends Jyuka despite Soji's reluctance of having Jyuka as his friend. He also cares about Jyuka like his own sister.
- Yumiko Takemiya: His boss at the part-time job. There are times when she helps Arata get closer to Hiyori.
- Daisuke Kazama: Arata thinks of him as weird as Soji. They do not share a close relationship, only appearing together when fighting Worms most of the time.
- Tsurugi Kamishiro: Tsurugi considers Kagami his great friend, and wants the best of things to happen to him. Kagami, however, cannot muster enough courage to reveal the truth that Tsurugi is actually Scorpio Worm all along to the millionaire, because he is afraid that it may hurt Tsurugi.
- Jiiya: Jiiya trusts Arata enough to tell him about Tsurugi's biggest secret. The two are usually seen discussing what to do with Tsurugi.
- Renge Takatori: At first, Arata and Renge have a very bad relationship. Arata dislikes her childish attitude while Renge dislikes Arata for being a clumsy senior. Later on, Renge begins to respect Arata more, particularly during the School ghost incident, when Arata tries to cheer up students when they are trapped in a bus shrouded with mist, which has been caused by a Worm's attack.
- Riku Kagami: Arata at first shows animosity towards his own father because of his nonchalance at the death of Ryo Kagami, his second son. After learning what his father has been through all the time, Arata finally understands the responsibility and love of Riku, and they become close once more. They are even seen playing catch with each other as adults on one occasion.
- Ryo Kagami: Arata cares about and loves his younger brother greatly. This even makes him reluctant at letting the Worm that mimicked his brother be destroyed.
- Masato Mishima: Initially, the two dislike each other because of their difference in personality. In the final stages of the series, when Mishima becomes the last obstacle, Arata is determined to finish him off for good. Mishima admits in the final episode that he has always hated men who are "straight as an arrow" like Arata.
Behind the scenes
- The motif of Gatack is that of a "Kuwagatamushi" or stag beetle as opposed to Kabuto whose motif is that of a rhinoceros beetle.
- He is one of two Riders whose Masked Form provides additional offensive capabilities, the Gatack Vulcan, in addition to increased defense, the other being Sasword's Blood Vessels.
- The name is a portmanteau of "kuwagata" and "attack" forming Gatack, which ironically would foreshadow who he would be after abandoning TheBee Zecter.
- Gatack's Hyper Form is exclusive to the series' Hyper Battle DVD. Unlike Kabuto, whose armor experiences a major remodeling upon transforming, the changes from Gatack to Hyper Gatack are minimal, only changing his helmet and adding a Tachyon breastplate, which does not open up during Hyper Clock Up. Gatack gains no new weapons or capabilities as Hyper Gatack beyond the use of Hyper Clock Up and a Hyper Kick, though he retains the use of the Gatack Calibur.
- Gatack is considered the Secondary Rider of Kabuto despite being the fifth Rider seen in the show. This is most likely due to his frequent appearances in the series especially with the main Rider, as well as his theme (Kuwagatamushi), which is often portrayed as the "counterpart" of Kabutomushi.
- It is also noted that the opening of Kamen Rider Kabuto started to update after Gatack started his debut, the tradition that is always be done to any Kamen Rider's opening video whenever the second rider started to appear late in the show.
- His first name shares the same pronunciation with Alata/Gosei Red from Tensou Sentai Goseiger.