Eiji Hino

"If there is a hand reaching for help, and I don't reach out my hand when I can. The regret would make me wish I were dead... I reach out my hand, because I don't want that"

- Eiji Hino

Eiji Hino (火野 映司) is Kamen Rider OOO (仮面ライダーOOO (オーズ)). He is the main protagonist and one of the main characters in Kamen Rider OOO. He made a cameo debut in the film Kamen Rider W Forever: A to Z/The Gaia Memories of Fate where he fought against the Luna Dopant. Before Eiji Hino, there was a previous Kamen Rider OOO who had fought and sealed the Greeed away.

Eiji Hino
Eiji Hino (火野 映司) is the son of a politician who travels the world with his grandfather. While at Africa a year prior to the series, Eiji attempted to use his fortune to help out a village. Eiji, who traveled in order to learn more about the Arabic word “maktab” ends up meeting and befriending a girl named Alfreed. He follows her to her village and gets to know the people and their culture. As it turns out, Cain (Alfreed's brother), became an assassin for an enemy tribe in order to survive. Alfreed is eventually killed in the war, Eiji is saddened over this and tries not to let this happen again. Though the Hino family used his sob story to get the people's support, the ordeal caused Eiji to lose any desire and become willing to help those in need, going so far to even risking his life for complete strangers.

Personality
Despite often coming off as happy-go-lucky in his personality, Eiji is actually quite strong-willed and was easily able to pick up on the fact he could use Ankh's need for him and the OOO Driver to keep the Greeed in line. Another defining trait is Eiji will fight to protect anyone in need, even complete strangers and at the risk of his own life. This stemmed after his regret from not saving the little African girl he befriended during a civil war which his family fortune started. He keeps a collection of coins and almost always has pairs of underwear of different designs and colors which he at times even gives to others. This is revealed to stem from an optimistic outlook thought to him by his grandfather, who said that all a man needs is a pair of underpants for tomorrow. Eiji possesses no selfish desires which made him ideal for being OOO but also became a weakness once the Purple Core Medals sought out a host, as they immediately found him and took root. However, taking the advice of Akira Date, after becoming a Greeed, Eiji remembers the desire he had so long ago; Eiji wanted the power to protect people no matter where they are, which Ankh gave to him in the form of the OOO Driver.

W Forever
Before Double and Luna could start fighting, Eiji accidentally drop the Taka Core Medal, which rolled up to Double's foot. He then throws back to Eiji and told him to leave, but Eiji says that he will leave after fighting Luna Dopant. As he transform into OOO, Double was surprised about his abilities. After OOO mange to defeated Luna Dopant, before Double heads to Futo Tower, he tell his senior that Riders help out each other.

Kamen Rider OOO
He returned to Japan to fund for more of his travels. His latest part-time job, a security guard at the Kougami Art Museum, ends due to the destruction of the museum around him due to him being drugged to sleep by some would-be robbers. Eiji takes a strange red coin he found while off duty which he thinks is his pay. This causes a disembodied arm to begin to follow him around, until the arm announces that it is called Ankh and is one of the ancient beings known as the Greeed, and he needs Eiji's help to become King. When they are attacked by a monster called a Yummy, Eiji risks his life to rescue Ankh, who in return saves him and gives Eiji two more strange coins, calling them Medals, and a belt, enabling Eiji to transform into Kamen Rider OOO.

After destroying the Yummy and further encounters with the Greeed, people from the Kougami Foundation begin to approach Eiji, offering their assistance in the fight against the Greeed and Yummy, but their true motives are not clear. He also gets a job and housing at the Cous Coussier, after the owner Chiyoko Shiraishi finds out that he is a world traveler. In the process, joined by Akira Date, Eiji learns more of the Greeed's desire to become whole and the reason why Ankh is unable to assume his complete form. However, things changed when Eiji ended up becoming a host to half of a set of Purple Core Medals that react to his lack of selfish desires, the same presumed reason why he is able to use Kamen Rider OOO's powers without any sign of going berserk so far like the First OOO, with dangerous consequences. Soon after, Eiji learns from Kousei Kougami, the Foundation's owner, that the only way to counteract the purple Core Medals is to acquire a desire of his own, something he is yet capable of.

Later on, he turns into the dinosaur-like Eiji Greeed (映司グリード) after absorbing two more purple Core Medals from the other Purple Greeed, Kiyoto Maki, in a bid to make him go beserk. However, it was by then Eiji remembers his desire is to have the power to help others and later agrees to Kougami's suggestion to absorb all the Cell Medals in the Kougami Foundation's possession to achieve that desire. However, it does not halt Eiji's Greedification during his his final battle when he uses all the Cell Medals in his body in a risky attack that fails to destroy Maki. But before Eiji does something stupid, Ankh gives Eiji his last three Core Medals, disappearing from Shingo and allowing Eiji to transform to defeat Maki, resulting in the disappearance of the Core Medals, with Ankh's sole remaining Core Medal splitting in half.

As a now-normal Eiji falls back to the Earth, Ankh appears to him as his disembodied arm, saying his farewells, before disappearing into half of the broken Taka Medal that once held his consciousness. Saved by Kamen Rider Birth, receiving the other half of Ankh's Core Medal that Hina found, Eiji leaves Japan and resumes his journey around the world while trying to find a way to fix the broken Taka Medal with a spectral Ankh arm following him.

Movie War Mega Max
Eiji returns to Japan as he sees Ankh waiting for him in the airport, which made him curious since Ankh's Core Medal is still broken. While Date and Goto fights Kamen Rider Poseidon as Birth and Birth Prototype respectively, Ankh and Eiji plan to steal some Core Medals from the Rider, which they succeed. Eiji transforms and fights Poseidon, until he noticed that the Rider is suffering. After the battle, they went to Cous Coussier as Eiji asks Ankh how did he revive, but he decides not to answer him. Besides that, Eiji thinks that the Rider he fought before needed his help. Out of nowhere, Waste Yummies appear as Eiji and Ankh fights them in the restaurant and then outside. They find Michal, who then transformed into Poseidon as he is prepared to fight them. Ankh gives Eiji the medals, but he refuses as he thinks Michal is suffering from Core Medals, similar how Eiji suffers from the purple medals. Poseidon started to attack, but Michal stops him from killing Eiji as Michal reverted back to himself. Michal tells them that he can't be a Rider since he is scared of water, until Kogami appears giving him the Poseidon Driver. Michal couldn't handle it's power, but the portal opens as it spills Core and Cell Medals into him that resulted in Michal being possessed.

While Ankh is sleeping, the possessed Michal is planning to take the Core Medals, however Eiji stops him as he becomes OOO Sagohzo Combo, so Ankh can gain back more Core Medals. Even though OOO is on Sagohzo Combo, the possessed Michal overpowers him which canceled the transformation, as Poseidon started to form its own body. On the next day, Kogami calls Eiji that he is the only one that can fight Poseidon as Date and Goto were still recovering from the battle. Before confronting Poseidon, Michal wonders why Eiji isn't worrying, as he gives Michal his pants telling him that to keep on living for the next day.

As they confront the enemy, Poseidon summons Waste Yummies as Eiji and Ankh fights them. While fighting, Eiji wonders if this is their final time fighting together as Ankh replies that he will find the answer if Eiji lives. Eiji transform and fights Poseidon while Ankh hold off the Waste Yummies, until Date, Goto, and Satonaka arrive to provide backup for them. Poseidon overpowers OOO, until Michal appears facing his fear of water, which he transform into Kamen Rider Aqua. After Poseidon is defeated by Aqua and OOO Tajadol Combo, Aqua returns to his time as Ankh leaves, which caused Hina to worry. Eiji finally figured out that this Ankh is from the future meaning that he somehow managed to restore his Core Medal. Foundation X appears attacking Eiji, gaining Poseidon's Core Medal which made Eiji wonder who they are.

Eiji arrived where the Kamen Rider Club are and asks Gentaro to join him to fight their opponent. They then meet up with Shotaro and Philip, who the latter gave Eiji and Gentaro information about Foundation X and Lem Kannagi's plan. After having enough information, members of Foundation X transform into Zodiarts and prepare to attack them. Shotaro, Philip, Eiji, and Gentaro transform as Double takes down the Zodiarts, while OOO and Fourze confronts Lem. Lem uses the monster to distract them as the Exodus is preparing to be launched. After OOO and Fourze finishes off the monsters, the replicas of Dopants and Greeeds appears as Fourze gives OOO the Rider Medals to restore the Seven Legendary Riders.

Before confronting Lem, Aqua returns to the past and gives OOO a set of new Core Medals. As Fourze and OOO manage to reach the Exodus, Lem transforms into Super Galaxy King and overpowers the Riders by using Poseidon's medals to stop time. He then throws Fourze off the ship, which gives OOO a hard time dealing with him. OOO uses the new Core Medals which changes him into Super Tatoba Combo as they fought on equal ground until Fourze arrived. They then fought outside of the Exodus as Super Galaxy King blasted the Cosmic Energy at Fourze, which made Fourze increase its power. They finish off Super Galaxy King as the Exodus is about to explode. After the battle against Super Galaxy King, Eiji resumes his journey of restoring Ankh's Core Medal.

Kamen Rider OOO (novel)
It was revealed after the Mega Max event, Eiji returns to the same country which he met Alfreed and decides to help and put an end to the war. He does so by using the OOO Driver, in a similar way to what the King did. Starting with Tatoba as a diversion, he quickly uses Gatakiriba and destroys the soldiers’ guns, Latorartar to destroy tanks and Sagohzo to stop rocket launchers. He uses Tajadol to take down the air forces while safely rescuing the pilots. In the dried out deserts, Eiji uses Shauta in order to create rain. The enemy tribe gets scared and the war slowly stops.

Super Hero Taisen
Eiji and Hina were surrounded by the Dai-Zangyack army. When he was fighting with the army, he found Daiki (as DiEnd) being cornered by Marvelous (as Gokai Red). At that dangerous situation, he ended up being hit by Marvelous' Dimensional attack to protect Daiki. Later, he catches up with Joe and Daiki when they were in the Dark Dimension and said that the real battle has just begun. He teamed up with the Gokaigers during the battle with Bio Hunter (in this movie as Rider Hunter) Silva and give them the rest of the Core Medals which turn into Ranger keys and being called as the OOO's Grand Power by Joe.

Movie War Ultimatum
When Koyomi came under attack by Ghouls after all the Riders entered Yu Kamimura's Underworld, Eiji appeared and fought them off. He explained that Gentaro called and asked for his help, and that whenever one Kamen Rider needs help, the others will do everything they can to answer this call. This seems to make Koyomi's Please Ring glow, and within the Underworld, phantom images of Eiji (along with Shotaro, Phillip, Ryu, and Goto) gave the Rider Rings to the children, telling them to put their hands with another. Touching the Rings to Haruto's belt casts a spell that summons copies of Double, Accel, OOO and Birth, who help Wizard and the Space Kamen Rider Club defeat the Akumaizers.

Super Hero Taisen Z
"We'll show you what Riders are truly capable of!"

- OOO

Eiji returned in Super Hero Taisen Z and helped the, , and other Kamen Riders defeat Space Shocker and.

Kamen Rider Wizard
OOO appears with all the Heisei Riders from Kuuga to Fourze, led by Decade, in a special two-parter after the finale, The Kamen Rider Rings and Neverending Story.

Kamen Rider Taisen
OOO was seen fighting Badan's monster. Later, as he was about to execute Tatoba Kick, the possessed Riderman throws OOO to the ground. He was later seen flying with other Riders in Tajadol Combo.

Kamen Rider Climax Heroes
Kamen Rider OOO appears in the Kamen Rider Climax Heroes game series, beginning with his own installment (Climax Heroes OOO). In his first appearance, OOO only can use the Tatoba, Gatakiriba, Latorartar, and Sagohzo Combos (as well as any Random Combo using combinations of those Medals). In Climax Heroes Fourze, he gains Shauta, Tajadol, and Putotyra, with Burakawani as a special stand-alone character. Climax Heroes Fourze also has an exclusive Purple-Eyes version of Tatoba, representing Eiji going berserk under the influence of the Purple Core Medals; this character does not appear in the sequel, Super Climax Heroes.

All Kamen Rider: Rider Generation 1 & 2
Kamen Rider OOO appears as the main character of All Kamen Rider: Rider Generation, whose plot is loosely inspired by OOO, Den-O, All Riders: Let's Go Kamen Riders. He also appears in the sequel All Kamen Rider: Rider Generation 2, where he and Kamen Rider Double can perform the Double Xtreme/Prominence Drop combination attack from Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core.

Kamen Rider Battride Wars
Kamen Rider OOO appears in Kamen Rider Battride Wars, which unites the riders of the Heisei era from Kuuga to Wizard. OOO is the last Rider saved along the second story path, and breaks free of Mnemnosyne after reliving the memory of his final battle with Kiyoto Maki.

In Battride War, OOO has access to all his normal Full Combos after taking amounts of many hits on his enemies until the Full Combos are available to transform, but will automatically transform back into Tatoba after a set period of time (reflecting the danger of over-using Full Combos). Additionally, only Tatoba and Putotyra possess more than one special attack, though the other Combos will use their special powers during their basic combos (for example, Latorartar Combo begins with the Liodias and Tajadol can launch fireballs in mid-air).

OOO's special attacks are:


 * Tatoba Combo: Tora Claw Multi-Slash, OOO Bash, Tatoba Kick
 * Gatakiriba Combo: Gatakiriba Kick
 * Latorartar Combo: Gush Cross
 * Sagohzo Combo: Sagohzo Impact
 * Shauta Combo: Octo Banish
 * Tajadol Combo: Prominence Drop
 * Putotyra Combo: Strain Doom (used after transforming), Tail Divider, Gust, Blasting Freezer

Kamen Rider Batton-Line
to be added

Kamen Rider Travelers Record
to be added

Equipment

 * OOO Driver
 * O Scanner
 * O Medals
 * O Medal Holder
 * Medajalibur
 * Medagabryu
 * Burahngi
 * Ride Vendor
 * Candroids
 * Taka Candroid
 * Tako Candroid
 * Batta Candroid
 * Tora Candroid
 * Unagi Candroid
 * Kujaku Candroid
 * Ptera Candroid
 * Torikera Candroid
 * Furifuri Candroid (Ganbaride)

Ranger Keys

 * see also: 

The Kamen Rider OOO Ranger Keys (仮面ライダーOOO (オーズ)レンジャーキー) appeared when Eiji gave his OOO Medals to the Gokaigers, transforming them into these keys. In Super Hero Taisen, these keys changed the Gokaigers into OOO's Full Combos, and were then used to power the GokaiGalleon Buster.
 * Kamen Rider OOO Tatoba Combo Ranger Key (仮面ライダーオーズタトバコンボレンジャーキー): The Rider Ranger Key that represents the Multi Combo; it is exclusive to the toyline.
 * Kamen Rider OOO Gatakiriba Combo Ranger Key (仮面ライダーオーズガタキリバコンボレンジャーキー): The Rider Ranger Key that represents the Strongest Combo; it was given to Don Dogoier/Gokai Green.
 * Kamen Rider OOO Latorartar Combo Ranger Key (仮面ライダーオーズライトラーターコンボレンジャーキー): The Rider Ranger Key that represents the Scorching Combo; it was given to Luka Millfy/Gokai Yellow.
 * Kamen Rider OOO Sagohzo Combo Ranger Key (仮面ライダーオーズサゴーゾコンボレンジャーキー): The Rider Ranger Key that represents the Gravity Combo; it was given to Gai Ikari/Gokai Silver.
 * Kamen Rider OOO Shauta Combo Ranger Key (仮面ライダーオーズシャウタコンボレンジャーキー): The Rider Ranger Key that represents the Marine Combo; it was given to Joe Gibken/Gokai Blue.
 * Kamen Rider OOO Tajadol Combo Ranger Key (仮面ライダーオーズタジャドルコンボレンジャーキー): The Rider Ranger Key that represents the Blazing Combo; it was given to Captain Marvelous/Gokai Red.
 * Kamen Rider OOO Putotyra Combo Ranger Key (仮面ライダーオーズプトティラコンボレンジャーキー): The Rider Ranger Key that represents the Invincible Combo; it was given to Ahim de Famille/Gokai Pink.

Appearances

 * Kamen Rider OOO's episodes
 * Episode 1 - Medals, Underwear, and the Mysterious Arm
 * Episode 2 - Desire, Ice Pops, and Presents
 * Episode 3 - A Cat, Evolution, and a Glutton
 * Episode 4 - Doubt, a Picture Message, and a Helping Hand
 * Episode 5 - The Chase, a Nest, and the Celebrity
 * Episode 6 - Clothes, a Contract, and the Strongest Combo
 * Episode 7 - A Lousy Husband, a Trap, and a Jackpot
 * Episode 8 - Sabotage, Unselfish, and Taking a Break
 * Episode 9 - Soaked, the Past, and the Scorching Combo
 * Episode 10 - The Fist, an Experiment, and a Super Bike
 * Episode 11 - The Traveler, a Swallowtail Butterfly, and a Celebrity
 * Episode 12 - The Eel, the World, and the Gravity Combo
 * Episode 13 - The Siamese Cat, Stress, and the Genius Surgeon
 * Episode 14 - Pride, Surgery, and the Secret
 * Episode 15 - The Medal Struggles, the Transporter, and the Vessel
 * Episode 16 - The End, the Greeed, and the New Rider
 * Episode 17 - The Kendo Girl, Oden, and the Separating Yummy
 * Episode 18 - Destruction, the Reason, and the Eel Whip
 * Episode 19 - The Red Medal, the Detective, and Betrayal
 * Episode 20 - The Decoy, Quantification, and the Flaming Combo
 * Episode 21 - The Grasshopper, Father and Son, and the Ally of Justice
 * Episode 22 - Chocolate, Faith, and the Power of Justice
 * Episode 23 - Beauty, an Egg, and the Sleeping Desire
 * Episode 24 - Memories, Love, and the Marine Combo
 * Episode 25 - The Boxer, the Left Hand, and the Bird Yummy
 * Episode 26 - Ankh, the Ring, and Placing Everything On
 * Episode 27 - 1000, the Movie, and the Combatant
 * Episode 28 - 1000, the Kamen Riders, and the Birthday
 * Episode 29 - The Big Sister, the Doctor, and the Truth about Ankh
 * Episode 30 - The King, the Panda, and the Flames of the Memory
 * Episode 31 - Gratitude, Scheming, and the Purple Medals
 * Episode 32 - The New Greeed, Emptiness, and the Invincible Combo
 * Episode 33 - Friendship, Chaos, and the Left-Behind Belt
 * Episode 34 - The Best Friend, Uses, and Their Relationship
 * Episode 35 - Dreams, the Big Brother, and Birth's Secret
 * Episode 36 - Broken Dreams, a Body, and the Greeed Resurrection
 * Episode 37 - Sleep, One Hundred Million, and Birth's Transfer
 * Episode 38 - Circumstances, Farewell, and a Tearful Birth
 * Episode 39 - Nightmare, Surveillance Cameras, and Ankh's Counterattack
 * Episode 40 - Domination, a Birthday Party, and the Disappearance of Ankh
 * Episode 41 - Siblings, the Rescue, and Eiji Leaves
 * Episode 42 - Ice, Greedification, and Broken Wings
 * Episode 43 - A Vulture, Confrontation, and Ankh Returns
 * Episode 44 - Everyone is Together, Full Resurrection, and Your Greed
 * Episode 45 - Surprise, Proto-Birth, and the Desire of Love
 * Episode 46 - Eiji Greeed, Double Births, and Ankh's Desire
 * Episode 47 - The Red Cracks, Satisfaction, and Eiji's Vessel
 * Episode 48 - Finale: The Medals of Tomorrow, Underwear, and Arms Held
 * Kamen Rider Double Forever: A to Z/The Gaia Memories of Fate (cameo and debut)
 * Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core
 * OOO Portion
 * Movie War Core Portion
 * OOO, Den-O, All Riders: Let's Go Kamen Riders
 * OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~
 * Kamen Rider OOO WONDERFUL: The Shogun and the 21 Core Medals
 * Net Movie: Kamen Rider OOO Allstars: The 21 Leading Actors and Core Medals
 * Kamen Rider OOO Hyper Battle DVD: Quiz, Dance, and Takagarooba!?
 * Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max
 * Beginning: Fight! The Legendary Seven Riders (Cameo)
 * Kamen Rider OOO: Ankh's Resurrection, the Medals of the Future, and the Leading Hope
 * Kamen Rider Fourze: Nadeshiko, Descend (Cameo)
 * Movie War Mega Max: Gather! Warriors of Glory
 * Kamen Rider × Super Sentai: Super Hero Taisen
 * Kamen Rider × Super Sentai: Super Hero Taihen – Who’s the culprit?!
 * Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum
 * Movie War Ultimatum Portion
 * Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z
 * Kamen Rider Wizard TV Specials
 * Special 1 (Episode 52) - The Kamen Rider Rings
 * Special 2 (Episode 53) - Neverending Story
 * Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai

Portrayal
Eiji Hino is portrayed by Shu Watanabe (渡部 秀), who wrote all of the ending themes of the series.

As Kamen Rider OOO, his suit actor is Seiji Takaiwa (高岩 成二), who has been the suit actor for the majority of leading Heisei Kamen Riders. Aside from OOO, Seiji Takaiwa was also the suit actor for Eiji when he became Kamen Rider Birth in summer movie.

As Eiji Greeed, his suit actor was Yugo Fujii (藤井 祐伍), who is also served as suit actor for Kyoryu Greeed. Yugo Fujii later becomes main suit actor for Kamen Rider OOO in Movie War Ultimatum.

Tatoba Combo Ranger Key
The Kamen Rider OOO Tatoba Combo Key (仮面ライダーオーズタトバコンボレンジャーキー) is a Ranger Key based on Kamen Rider OOO's basic Multi Combo. The Kamen Rider OOO Tatoba Key was released in conjunction with the six other OOO Combo Rider Keys which appeared in Super Hero Taisen, while the Tatoba Combo Ranger Key only exists as a toy. Of course as with all Ranger Keys, should it exist, this Key would be able to transform one into Kamen Rider OOO's Tatoba Combo.

In Popular Culture

 * OOO in Tajadol Combo made a cameo appearance in the Cafe Detective Club manga by Fujishiro Takeshi (also creator of Nagasarete Airantou) as a silhouette alongside Ultraman Zero & the Gokaigers.
 * In the Hayate no Gotoku manga, the Tajadol Combo suit was parodied by Sakuya Aizawa, wearing a bird costume with "Tajadol Combo" written in the middle of the costume.
 * In episode 9 of Haiyore! Nyarko-san W has Nyarko make several references to OOO, including her using Eiji's trademark battle cry "Seiya" (セイヤッ) throughout the episode as well as wielding a weapon, similar to the Medajalibur, performing the Tajadol Combo's Prominence Drop, and mimicking Eiji's transformation pose. When the episode's villain is defeated, he shouts out "Sagohzo!", a reference to episode 5, where Nyarko used "Tatoba!" and "Gatakiriba!" as yelps of pain.

Behind the scenes

 * His title is pronounced similarly to both "Os," refers to the three O's in the series title which represent the character's transformation items, as well as meaning "multiple kings (王ｓ)".
 * The three O's also represent the infinity symbol with an additional circle over the center, stating that Kamen Rider OOO is Over Infinity.
 * The count of all of his transformations (both Full Combos and Random Combos) is the largest count in franchise history, with the possibility of 129 different forms, and this doesn't take into consideration the possibility if the Kangaroo, Panda, and the Orange Core Medals could form Random Combos.
 * The Purple Core Medals could possibly form Random Combos, as shown in the OOO Combo Change toys, but due to how powerful and dangerous the medals are and them being fueled by the void of desire rather than desire itself, these medals' powers cannot be used in conjunction with the other Core Medals.
 * He is the third Rider that has his final-in-series form be his most powerful, but also carry a risk of overriding his nature and turning him into an incredibly powerful monster, with Yusuke being the first and Kenzaki the second.
 * He is the second Rider to turn into one of his series' monsters as a result of said form, Kenzaki being the first.
 * Eiji is the only of these three to do the following: get turned into a monster, have his nature overridden by this form, but overpower the form and use it to his advantage, only to gain his humanity back after the form is lost.
 * He is the first Neo-Heisei Rider to create a new variant of the Rider Kick - the Slide Kick
 * He is the first Rider to be able to use a tail in one of his Rider forms. The second would be Wizard.
 * Eiji's past which involves with a little girl that later died due to a civil war is similar to Deunamists of Ultraman Nexus from the series with same name as both of them fight as heroes due to their failure to save someone they love.
 * During the veteran Kamen Rider's fights in Movie War Ultimatum, OOO was the only Rider to have been voiced by Shu Watanabe himself since the reappearance of Double in Movie War Mega Max.
 * Eiji is the only Primary Rider of the Neo-Heisei period who does not have a pre-battle quote.
 * Eiji is the only Rider who defeats the final villain in his Super Form.
 * In episode 12, it is shown that Eiji has a fear of snakes. Ironically, he gets the Burakawani Combo later on, with the head Medal being represented by a venomous snake.
 * Eiji is the third Primary Rider to transform into his series' Secondary Rider, with the first being Shoichi Tsugami and the second being Shinji Kido.