|This article is about a rider in Kamen Rider Blade.|
Hajime Aikawa (相川 始, Aikawa Hajime) is the human identity assumed by the current Joker Undead (ジョーカーアンデッド, Jōkā Andeddo) using the appearance of the Human Undead. Masquerading as the Mantis Undead, Hajime transforms into Kamen Rider Chalice (仮面ライダーカリス, Kamen Raidā Karisu, Masked Rider Chalice).
He is a mysterious man who is the Joker Undead, the most fearsome of the Undead as his victory in the Battle Fight would mark the end of all life on Earth. Unsealed around the time the other Undead were released, Joker battled the Mantis Undead and uses the sealed Category Ace of Hearts (Change Mantis) to become the wild card Kamen Rider Chalice. He later seals the Human Undead, who willingly surrendered to him without resistance, using the card to assume human form. The effect of prolonged use of both of these cards to assume their forms resulted in both the Human Undead's compassion for life and the Mantis Undead's fighting spirit collectively suppressing Chalice's natural destructive impulse as the Joker.
However, many of the Royal Club Undead who knew his true identity made attempts to dispose of him. One such attempt by the Giraffa Undead ended with an innocent bystander named Shin Kurihara a.k.a. Amane's father witnessing the battle being mortally wounded by accident in the skirmish. The dying photographer handed him a photograph of his family and Joker decides to protect his family in which he did to atone for his death. The Joker took on the identity of freelance photographer Hajime Aikawa since then. He never had good luck with humans, due to the misunderstandings, misgivings and misfortunes he has from a few he encountered seeing him only as a monster such as a mother & child he saved from the Shell Undead, only for his hands to get slapped away in fear & Jin Ichinose, who ungratefully blames him for destroying his lifelong dream. But despite how less he thinks of humanity, Hajime's time living at Jacaranda Cafe with Kurihara's family warmed him up to humans and eventually, he wished for himself to be human instead of being the Joker.
Though he and Kazuma disliked each other earlier, Hajime's growing humanity eventually warms up to Kazuma, who becomes a dear friend of his, then Garren and later to a limited extent, Mutsuki as well. However, when the Caucasus Undead takes most of his cards, the sealed Mantis Undead among them, it causes Hajime to regress back into the Joker after attempting to resist until Leangle unseals Hajime's cards and use the Undead against him. Even after managing to reseal them all, the Joker failed to regain control and goes on a rampage until he is provided with the Evolution Paradoxa, allowing Hajime to finally have full control of himself. This allows him to even assume Wild Form, which he previously avoided to the best of his abilities, without losing control. This lasted until the Giraffa Undead was sealed, with Hajime losing control and his impulse as Joker bringing forth with the Stone of Sealing creating his army of Darkroachi to eliminate all humans.
In the end, Kazuma is the only one to fight him head-on, with Hajime pleading Kazuma to defeat and seal him. However, Kazuma himself mutates into the Joker through the excessive use of King Form transformation in order to save Hajime and made his victory null, continuing the fight, retracting all unleashed Dark Roaches and prolonging destruction indefinitely. This effectively renders them rivals by instinct and they can never see each other again, or they would be forced to fight to the death for dominance the next time they meet. Moments after the battle, Hajime lives with the Kurihara family and was allowed to keep his Spirit Card to maintain the human disguise.
Post series and other events
To be added
Kamen Rider Decade
Kamen Rider Chalice appears with other Kamen Riders commanded by Wataru Kurenai, but all are murdered by Decade in episode 1 of Kamen Rider Decade in the dream of Natsumi Hikari and then conclude the dream with Decade as the only Rider in the Rider War. [Rider War]
The Destroyer of Worlds
In the special version of episode 31, Kamen Rider Chalice 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. [The Destroyer of Worlds]
As Kamen Rider Chalice, Hajime was also 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. [OOO, Den-O, All Riders: Let's Go Kamen Riders]
When history is changed, Hajime becomes one of the brainwashed Riders.
But later, Hajime, alongside Mutsuki, Tachibana, and Kenzaki, aided the riders against Shocker after they despise how Shocker acts and also had themselves freed from brainwashing immediately thanks to Go and Yuto, including a now redeemed Kyoichiro for defeating them earlier, even after Takeshi Hongo alongside Hayato Ichimonji broke free from Rider Robo.
Unfortunately, Chalice was among the Riders whose existence was erased by the Rider Robo. This fate, however, was rendered moot when the Rider Robo was finally destroyed by Shurikenjin Tridoron, restoring Chalice's place in history.
Chou Super Hero Taisen
Kamen Rider Heisei Generations FOREVER
Kamen Rider Chalice Wild Form appears as a toy , when Sento Kiryu and Sougo Tokiwa they find Ataru Hisanagahe 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.[Kamen Rider Heisei Generations FOREVER]
Appearances in other media
OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~
Type8. - The Strange Has a Match Strangely!
Card Riders Garren and Chalice along with General Shadow are seen in the Card Rider Poker Battle. Garren had an impressive and flush hand, Chalice a straight hand, General Shadow also had a strategy in his hand, but Kamen Rider Ryuki is very different and his probability to win. When all present his hand, Ryuki uses Strange Vent to change the cards of all players except himself. Chalice had another card game. Finally, General Shadow gives his business cards to everyone.[Type8. - The Strange Has a Match Strangely!]
Type16. - The Destroyer Destroys the Match!
Card Riders Garren and Chalice along with General Shadow are seen in the Card Rider Poker Battle. Garren had an impressive and flush hand, Chalice had a straight hand, General Shadow also had a strategy in his hand, but Kamen Rider Decade does not have a good hand. He uses Final Form Rider Card transforming all the players except Decade in different articles. Chalice is transformed into Chocolate Heart.[Type16. - The Destroyer Destroys the Match!]
Type22. - A Man's Lucky Food is Oden!
Kamen Rider Chalice Wild Form appears with Decade Complete Form, Exceed Gills, and Orga. According to Momotaros, Chalice's Wild Form is considered a lover for girls.[Type22. - A Man's Lucky Food is Oden!]
Type24. - I'll Investigate This Match!
Card Riders Garren and Chalice along with General Shadow are seen in the Card Rider Poker Battle. Garren had an impressive and flush hand, Chalice had a straight hand, General Shadow also had a strategy in his hand, but Kamen Rider Raia does not have the luck. When the cards lined up, Chalice is testified when Raia chose General Shadow as a volunteer and ends up choosing wrong. Chalice also saw how a metal pot fell from the sky, rendering General Shadow unconscious.[Type24. - I'll Investigate This Match!]
Type29. - Get it! The Stone of the King!
Kamen Rider Chalice Wild Form appears with Gatack, V3, and OOO Tajadol Combo. According to Kivat-Bat the 3rd, Chalice's Wild Form is considered a least compatible match.[Type29. - Get it! The Stone of the King!]
Type32. - The 13th Fights Infinitely!
Card Riders Garren and Chalice along with General Shadow are seen in the Card Rider Poker Battle. Garren had an impressive and flush hand, Chalice had a straight hand, General Shadow also had a strategy in his hand, but Kamen Rider Odin had a bad hand and he did not have a chance to win. When all players showed up their hands, Odin uses Time vent to revert the game making it start all over but Odin know all the strategies of his opponents to win.[Type32. - The 13th Fights Infinitely!]
Type39. - Ice Pop! Your White Self Matures Later!
Kamen Rider Chalice Wild Form appears with Imperer, Raia, and TheBee. According to Momotaros, Chalice Wild Form is considered a least compatible match.[Type39. - Ice Pop! Your White Self Matures Later!]
Type40. - The Match Ignores the Way of the Knight!
Card Riders Garren and Chalice along with General Shadow are seen in the Card Rider Poker Battle. Garren had an impressive and flush hand, Chalice a straight hand, General Shadow also had a strategy in his hand, but Kamen Rider Knight is different and was most likely to lose. When everyone showed their cards, Knight uses Trick Vent and reveals 6 cards 3 pairs causing everyone to lose the game except himself.[Type40. - The Match Ignores the Way of the Knight!]
Type43. - The Lawyer Likes Goro-chan!
Kamen Rider Chalice appears with Kaixa, Agito Trinity Form, and OOO Ratoraba combo. According to Kivat-Bat the 3rd, Chalice is considered a least compatible match.[Type43. - The Lawyer Likes Goro-chan!]
Type48. - Searching for a Great Treasure Over the Match!
Card Riders Garren and Chalice along with General Shadow are seen in the Card Rider Poker Battle. Garren had an impressive and flush hand, Chalice a straight hand, General Shadow also had a strategy in his hand, but Kamen Rider Diend had a bad hand. He changed his plans by summoning the three Riotroopers. One of them gave him hot tea to Chalice. Diend then leaves the Poker Battle.[Type48. - Searching for a Great Treasure Over the Match!]
TypeEX. - Quietly Listen! The Sole Old-Model Rider
Kamen Rider Wild Chalice appears with Ryuki, Agito Trinity Form, and Drake. According to Sieg, Wild Chalice would make a splendid husband.[TypeEX. - Quietly Listen! The Sole Old-Model Rider]
Video Game Appearance
Kamen Rider Blade (video game)
All Kamen Rider Series
All Kamen Rider: Rider Revolution
Chalice appears in All Kamen Rider: Rider Revolution among other Riders using al his Rouses combos , but he doesn't use his Wild form in any attack.
All Kamen Rider: Rider Generation 2
Chalice appears in All Kamen Rider: Rider Generation 2, but he doesn't use his Wild form in any attack.
Kamen Rider Super Climax Heroes
Chalice appears in Kamen Rider Super Climax Heroes, with Wild Chalice being locked as his finisher move.
Kamen Rider Battle Ganbaride
Hajime Aikawa appears as Kamen Rider Chalice and Joker Undead as a playable character in this video game Kamen Rider Battle Ganbaride.
Masked Rider Expansion
Kamen Rider Chalice and his Wild Form appears as a playable character in this trading card game with other Kamen Rider Kamen Rider Heisei-Era, Showa-Era, Super Sentai, Metal Heroes, and other Heroes.
Kamen Rider Battle: Ganbarizing
Hajime as Chalice appears as an of the many Kamen Riders in Kamen Rider Battle: Ganbarizing he is an unlocked character using his Rouses Combos against his enemies, also he has his Wild Form in the videogame.
Kamen Rider Riderbout
Kamen Rider Chalice ,Wild Chalice and Joker Undead appears as a playable character with the other Heisei and Showa kamen Riders in Kamen Rider Riderbout.
Kamen Rider: Battride War series
Kamen Rider Battride War
The Joker Undead appears as a boss in the video game Kamen Rider: Battride War. He only appeared in one chapter, which is set in Kamen Rider Blade's Final Episode, also replaced by Albino Joker as the recurring villain in later chapters. In the second installment, he appears as Joker Undead and as a recurring ally.
Kamen Rider Battride War II
The Joker Undead appears as a recurring ally, in the video game Kamen Rider: Battride War II. He only appeared in one chapter, which is set in Kamen Rider Blade's Missing Ace.
Kamen Rider Batton-Line
Kamen Rider Chalice appears as a playable character in Kamen Rider Batton-Line among other Riders in the game. He also appears as Joker Undead.
Kamen Rider Chalice, Wild Chalice, and Joker Undead appears with other Kamen Riders and Monsters in Battle Spirits.
Kamen Rider Buttobasoul
Kamen Rider Chalice and Wild Chalice are playable characters in Kamen Rider Buttobasoul.
Kamen Rider City Wars
Kamen Rider Chalice and Wild Chalice is a playable character alongside the other Kamen Riders in Kamen Rider City Wars.
Due his origin as the Joker Undead, Hajime was initially hostile towards others, treating only the Kurihara family with some kindness, out of his promise with Amane's father. Viewing humanity as a whole to be weak and useless, Hajime would antagonize the BOARD Riders on several occasions, seeing them as enemies.
From his life with Amane and her mother, as well as Kenzaki's acts of altruism though, Hajime gradually learnt the importance of compassion and empathy, causing him to recognize humanity's strength and worth. This would allow Hajime to become a more sympathetic individual, to the point of protecting complete stranger from any serious dangers.
Despite gaining a new outlook on life, Hajime would occasionally struggle with his nature as an Undead, going berserk on several occasions. Furthermore, his view towards the Undead race remain largely the same, feeling that destiny will force him to defeat every single one of his brethren. As such, Hajime would occasionally doubt himself, fearing that he would ultimately fulfill his role as the Joker Undead.
- "What's the strongest is, the human's heart"
- ―Hajime's proclamation after accepting humanity's value
Upon inadvertently winning the Battle Fight, Hajime almost completely succumbed to his instincts as an Undead, forcing him to begin exterminating all life on Earth. Despite his best attempts to stop himself, Hajime could only barely control his own actions, slowly becoming more feral with time.
Facing Kenzaki as his last obstacle, Hajime pleaded to his friend to end the mindless chaos, not wishing to continue living as a monster. At the end of their battle, Hajime learnt of Kenzaki's plan to mutate into an Undead, feeling immense guilt at what he had unknowingly caused. Kenzaki however, encouraged Hajime that they could choose their own destiny, promising to one day overcome his fate as an Undead. Respecting his friend's decision, Hajime resumed living among humanity, with he and the others silently awaiting for Kenzaki's return.
Powers and Abilities
- Biological Immortality: As an Undead, Hajime can survive from any physical injuries, no matter how grave they may be.
- Undead Mimicking: Hajime is able to use a sealed Undead's Rouse Card to obtain said Undead's form and powers.
- Undead Tracking: As Undeads are attracted to each other by instinct.
- World Destruction: As a Joker, if he is the only Undead existing in a world, that world will be destroyed.
Kamen Rider Chalice's ending theme is entitled "Take it a try"
- ―Transformation announcement[src]
- Rider Senses
- Eyesight: 5 km.
- Ability Parameters
- Punching Power: 320 AP (3.2 t.)
- Kicking Power: 520 AP (5.2 t.)
- Maximum Jump Height: 45 m.
- Maximum Running Speed: 100 m. per 4.8 sec.
- Special Attacks
- Hawk Tornado: 1400 MP (14 t.)
- Head Chop: 600 FP (6 t.)
- Plant Bio: 1600 MP (16 t.)
- Spinning Wave: 2000 AP (20 t.)
- Spinning Attack: 2600 AP (26 t.)
- Spinning Dance: 3600 AP (36 t.)
Ace Form (エースフォーム, Ēsu Fōmu) is the default form of Kamen Rider Chalice assumed by scanning the Change Mantis Rouse Card in the Chalice Rouzer. Unlike the BOARD Riders, Chalice is not a traditional "Kamen Rider", but rather the form of the Mantis Undead taken on by the Joker Undead as per his abilities. Though Chalice has especially high agility, he is superior to the Ace Forms of any of the BOARD Riders due to using the original Rouzer technology instead of an imitation. Chalice is equipped with the Mantis Undead's weapon, the Chalice Arrow, which can be combined with the Chalice Rouzer to scan Rouse Cards for special attacks instead of transformation.Appearances: Blade Episodes 1-9, 10 (flashback; archive footage only), 11-13, 15-26, 29-31, 32 (flashback only), 36-38, 40, 41 (imaginary only), 42-49,Decade Episodes 1, 31 (Special Version only),Let's Go Kamen Riders, Super Hero Taisen GP, Heisei Generations FOREVER (as a toy).
- ―Transformation announcement[src]
- Ability Parameters
- Punching Power: 420 AP (4.2 t.)
- Kicking Power: 620 AP (6.2 t.)
- Maximum Jump Height: 60 m.
- Maximum Running Speed: 100 m. per 4.5 sec.
- Special Attacks
- Wild Cyclone: 14600 AP (146 t.)
Kamen Rider Wild Chalice (仮面ライダーワイルドカリス, Kamen Raidā Wairudo Karisu) is Chalice's most powerful form, accessed by scanning the Evolution Paradoxa Rouse Card in the Chalice Rouzer. This fuses Chalice with all of the Hearts Suit Rouse Cards in a similar manner to Blade's King Form. Accordingly, this form grants Chalice enough power to fight evenly with Blade in King Form, a feat that no other Rider is capable of. Outside of its effectiveness in combat, this form allows Hajime to suppress his instincts as the Joker Undead. In addition, Wild Chalice has the power to fuse all of the Hearts Suit Rouse Cards into the singular Wild Card. Wild Chalice is equipped with the Wild Slasher, which he can use individually for melee combat or combine with the Chalice Arrow.Appearances: Blade Episodes 37-38, 40, 42-44, 45 (flashback; archive footage only), 46-47, 49, Chou Super Hero Taisen, Heisei Generations FOREVER (as a toy).
- ―Transformation announcement[src]
When the Joker Undead chose to assume a human identity, he used the Spirit Rouse Card to assume the form of the Human Undead and began using the alias Hajime Aikawa. From then on, Hajime preferred to always be in this transformation outside of battle, only cancelling the transformation and assuming his true form when absolutely forced to.Appearances: Blade Episodes 1-49, Blade vs. Blade
- ―Transformation announcement[src]
When Hajime's Ace card was taken by the Eagle Undead, he used the Float Dragonfly Rouse Card to assume the form of the Dragonfly Undead. He later gave his Float Dragonfly card to Kenzaki to defeat the Eagle Undead. After doing so, Kenzaki returned the card to Hajime along with the Change Mantis Rouse Card.Appearances: Blade Episodes 23, 32 (flashback; archive footage only), 36, 38 (flashback only), 41 (flashback only)
- ―Transformation announcement[src]
When Hajime lost all of his Rouse Cards, Kenzaki gave the Fusion Wolf card to him, which he used to assume the form of the Wolf Undead to battle Mutsuki. Since he harnesses the power of the Category Jack of Hearts, this form can be considered to be equivalent to Jack Form without the Rouse Absorber.Appearances: Blade Episodes 34, 41 (flashback only)
The Joker Undead is the true identity of Hajime Aikawa and the representative of death in the Battle Fight. When the Joker wins the Battle Fight by being the last Undead not sealed, the Stone of Sealing endlessly generates Darkroachi to exterminate all life on Earth. This happens when the Giraffa Undead is sealed, causing him to lose control of his Undead instincts and making him unable to take his human form with the Spirit Human Rouse Card. However, Kenzaki intentionally transformed himself into a second Joker Undead, restoring the Battle Fight and allowing Hajime to continue living as a human. However, if Kenzaki and Hajime ever crossed paths again, their Undead instincts would force them to fight each other.Appearances: Blade Episodes 32 (offscreen), 33-37, 41 (flashback; archive footage only), 44-49
- Chalice Rouzer: Chalice's transformation device
- Card Deck: Cards holder
- Rouse Cards: Allow Chalice to transform into Undead or perform special attacks
- Chalice Arrow: Chalice's personal weapon
- Wild Slasher: Wild Chalice's primary weapon
- Shadow Chaser: Chalice's Rider Machine
Legend Rider Devices
This Rider Ring which bears the likeness of Kamen Rider Chalice is exclusive to Kamen Rider Wizard's Wizard Ring toyline. When used by a Wizardriver wearer, it would be able to summon Kamen Rider Chalice.
- "(Digital beeping) Chalice!"
- ―Activation announcement[src]
Translation: The mantis rider known as the legendary Undead is... (Clock ticking noise) Chalice! (伝説のアンデッドと呼ばれたカマキリのライダーは…カリスだ!)"
Chalice Ridewatch (カリスライドウォッチ, Karisu Raidowotchi): Based on Kamen Rider Chalice, this Ridewatch would provide access to the ChaliceArmor. It is dated 2004.
After Another Blade was defeated by Zi-OTrinity, the latter whom absorbed Blade and Chalice's powers, it manifested into the Blade and Chalice Watches. Hajime Aikawa would entrust his powers to Sougo Tokiwa.
This Ridewatch was one of the five winners of a poll held by Bandai to select Riders to be used in a five-pack of DX Ridewatches.
- Kamen Riders:
- Kenzaki Kazuma/Blade: Hajime initially viewed Kenzaki as a foe, rebuffing his offer of becoming allies. However, Kenzaki's actions would slowly convince Hajime to trust him as a friend, recognizing his kindness and strength to be genuine. When learning of Kenzaki's decision to mutate into an Undead, Hajime initially became ridden with guilt, understanding that Kenzaki had sacrificed his humanity to stop Hajime's Darkroaches from exterminating all life on Earth. From Kenzaki's words of assurance though, Hajime decided to place faith in his friend, hoping that Kenzaki would one day return home.
- Tachibana Sakuya/Garren: Like his view towards Kenzaki, Hajime initially saw Tachibana as an enemy, with the feeling being mutual. From Kenzaki's actions though, both Hajime and Tachibana came to trust one another, becoming allies in battle. Even when given the chance to seal Hajime as the Joker Undead, Tachibana would ultimately relent, placing faith in him.
- Mutsuki Kamijo/Leangle: Due to the Spider Undead's influence toward Mutsuki, he and Hajime were bitter foes at first, both sides antagonizing one another. Once Mutsuki finally regained his former self though, the two would become allies, both fighting alongside one another as Kamen Riders. However, Hajime has occasionally clashed with Mutsuki over their views to the nature of Undeads, with Hajime believing that all Undeads are fated to fight one another, no matter the situation. Yet, Hajime's concern toward Mutsuki never waned, to the point of sparing him in his berserk state as the Joker Undead
- Amane Kurihara: Hajime initially viewed Amane as somewhat of an object to learn about humanity, though his concern towards her and her mother appeared genuine. From the time he spent with the Kurihara family however, Hajime grew very fond of Amane and her mother, seeing them as his own family.
- Kotaro Shirai: Shirai had his protective doubts about him after learning from Kenzaki he's an Undead. But in time, he came to accept him when around his sister & Amane.
- Shiori Hirose: TBA
Behind the scenes
- "Tell me, was it you? You're that Rider from before...and you have the antibody for Amane."
"I don't know, what are you talking about?"
"Why do you hide the fact that you're a Rider--No--What is your purpose?"
"I don't know. I really don't know anything at all."
"Then I'll tell her! I'll tell Amane that you're a Rider, and the number of times we've fought!"
"Try to tell her that...and I'm going to kill you!
Ittekure, kimi nandarou? Saki no Raidā… Kimi ga Amane-chan no tame ni kōtai o…
Shirimasen, nan no hanashi desu?
Naze Raidā dearu koto wo kakusu--Iie--mokuteki wa nan nanda?
Shirimasen yo. Hontou ni boku wa nani mo shiranai ndesu.
Jaa iuzo! Amane-chan ni omae ga Raidā datte, soshite nando mo ore to tatakatteiru to!
Sonna koto ittemiro, ore wa kisama wo bukkorosu!)"
- ―The full dialogue of the meme
In episode 6, Hajime's warning to Kenzaki "I will kill you!" (俺は貴様をぶっ殺す！, Ore wa kisama wo bukkorosu!) was popularly spread across the Internet due to his humorous facial expression, labeled as "Mukkorosu" (ムッコロス) by the Japanese community due to Hajime's slurring of the line making it sound like Ore~a, kusamuwomukkorosu! (ｵﾚｧ､ｸｻﾑｦﾑｯｺﾛｽ!). This is also acknowledged as part of the Ondul family meme that was spawned by Kazuma Kenzaki in the original series. Actor Ryoji Morimoto has re-enacted this line during his appearances in public events.
- As acknowledged in the hero change battle between Kamen Rider Decade and Gokai Red in Super Hero Taisen, the Riders of Kamen Rider Blade share their card motifs with the heroes from Shotaro Ishinomori's second and last Sentai series J.A.K.Q. Dengekitai. Chalice's Hearts motif would make him Blade's equivalent of Heart Queen. His true identity as the Joker would also make him the equivalent of Big One.
- The name "Chalice" comes from the Minor Arcana version of the Suit of Hearts: the Suit of Cups which symbolize the emotion and love that Hajime acquired over the series.
- He is the only Rider in Blade that doesn't need a Rouse Absorber to use an upgrade form, as well as the only Rider who does not need AP to use Rouse Cards, although the AP counter and its usage is never a major point in the series.
- Use of the Chalice Rouzer to access Wild Chalice is similar to how the Rouse Absorber was used to access Jack Form, as both versions of said form cause the augmented armor to display the card used on the chest. The difference was a Category King card was used, instead of a Category Jack.
- Hajime's name, which means "Beginning", is both ironic and symbolic: It is ironic, because he is supposed to bring about the end of the world, but it is also symbolic since his role as the Joker Undead is to begin a new Battle Fight, once exterminating all mortal life present.
- Hajime is the second Rider to become the "Final Boss" of a series, after Kamen Rider Odin.
- Hajime is a unique rider because all of his forms are originally the monsters of the series:
- Kamen Rider Chalice is a mimic of the Mantis Undead named Chalice.
- His human form is a mimic of the Human Undead.
- Joker is his true form, thus making Hajime the first rider who is originally a monster while all Orphnoch in Kamen Rider 555 are humans who are evolved into monsters by force.
- Kamen Riders Garren and Chalice were the focus of has been long-running fan debate regarding their status as the Secondary Rider. Toei and Bandai had confirmed Garren to be the Secondary Rider through video games and merchandising placing Garren with the position.
- From the show's debut in 2004, Chalice was already considered a Tertiary Rider., but strangely their roles are reversed in one marketing promo for Kamen Rider Zi-O: Over Quartzer.
- Part of this misconception may stem from the fact that in both of Blade's opening sequences, Hajime's actor is given second billing right after Kenzaki's actor. In most Kamen Rider openings, second billing is given to either the season's secondary Rider or a supporting character who has a very close relationship with the main Rider.
- Shinmei - Original Wolf Undead
- TV Asahi. (2004). Kamen Rider Chalice.
- Kamen Rider Official Data/Perfect File.
- Rouse Cards.
- TV Asahi. (2004). Kamen Rider Wild Chalice.
- TV Asahi. (2004). Human Undead.
- TV Asahi. (2004). Dragonfly Undead.
- TV Asahi. (2004). Wolf Undead.
- TV Asahi. (2004). Joker Undead.
- Official Perfect Books Celebrate The Zi-O Completion
- Hajime Aikawa on Kamen Rider Official
- Kamen Rider Chalice Ace Form on Kamen Rider Official
- Kamen Rider Wild Chalice on Kamen Rider Official
- Joker Undead on Kamen Rider Official
- Dragonfly Undead on Kamen Rider Official
- Wolf Undead on Kamen Rider Official