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Villain Overview

Masato Kusaka is the primary user of the Kaixa Gear to become Kamen Rider Kaixa and the villainous tritagonist of Kamen Rider 555. Despite being one of the main characters, Kusaka frequently comes into conflict with the heroes due to his manipulative and sociopathic tendencies, as well as his hatred of all Orphnochs, and is only allied with the other protagonists due to their shared opposition to Smart Brain.

He was portrayed by Kohei Murakami, who later portrayed Bud/Zyuoh Bird in Doubutsu Sentai Zyuohger.


Kamen Rider 555

Masato Kusaka grew up as one of the orphans in the Ryusei School fostered by Hanagata, the former head of Smart Brain. Kusaka was among the children implanted with Orphnoch DNA to grant them use of the Kaixa Gear though Kusaka was implanted with a great deal more DNA than the others, allowing him to transform and use the Kaixa Gear without dying afterwards.

Growing up, Kusaka's only friend was Mari Sonoda, leading to him forming an unhealthy attachment to her and eventually coming to see her as his possession. After the massacre at the Ryusei School reunion was instigated by the Dragon Orphnoch, Kusaka came to see all Orphnochs as monsters and vowed to wipe the all out.

Showing up to claim the Kaixa Gear, Kusaka becomes its primary user after he is the only one to survive transforming with it. Though he gets along well with Mari and Keitaro, Kusaka does not get along at all with Takumi, who is the only one who can see him for the manipulative sociopath he really is.

Eventually, Kusaka's Orphnoch DNA starts to run out and he dies after Yuji Kiba steals the Kaixa Gear from him and snaps his neck, disintegrating once all his Orphnoch DNA disappears and leaving behind his picture of a young Mari for her and Takumi to find.

Kamen Rider 555: Paradise Lost

In the alternate reality movie Kamen Rider 555: Paradise Lost, Kusaka was killed by Leo during the Riotrooper raid on the human sanctuary "Paradise". His Kaixa Gear was later used by Keitaro after he drank a transformation elixir allowing him to use it. The Gear disintegrated once the elixir ran out.

Kamen Rider 555: Grotesque Flowers

In the non-canon novel adaption Grotesque Flowers, Kusaka is the main antagonist, and the one responsible for killing Yuka Osada, a peaceful Orphnoch, driving Yuji Kiba to hate the human race. He later rapes Mari, causing her to become hopeless and depressed, and in response has his limbs ripped off by a disgusted Kiba. He is later taken in by his own admirer, Saya Kimura, before resurfacing to try and ruin Mari's life. He finally meets his end when he is killed by Takumi Inui.

OOO, Den-O, All Riders: Let's Go Kamen Riders

Kamen Rider Kaixa was part of a group of secondary riders led by Akira Date/Kamen Rider Birth who arrived to reinforce the primary riders in their fight against the Rock Great Leader. The Great Leader is finally defeated when all the Kamen Riders got on their bikes and performed the "All Rider Break" attack to destroy the Great Leader.

Heisei Rider v. Showa Rider: Kamen Rider Taisen feat. Super Sentai

Takumi is shown to have become depressed following Masato's death, which in the film is revised so Takumi witnessed him dying while fighting the Arch Orphnoch. His spirit later appears when the Badan Empire opens up the gate between the mortal world and underworld to taunt Takumi, getting him to go after Kamen Riders Wizard and X. However, the two Riders convince him to move on as Kusaka's spirit disappears once Badan's plans are foiled.

Kamen Rider Zi-O

Kusaka is somehow revived, alongside his rival Takumi as a result of a time paradox caused by the creation of Another Faiz.

Unlike his previous incarnations, Kusaka does much greater good, such as repaying someone who are related to Ryusei School and similar suffering as Masato was and risk his life to do this deadly task no matter what.


Though he acts polite towards everyone (except for Takumi), Masato Kusaka's true personality is that of a manipulative sociopath who only cares for himself and Mari. Even in regards to Mari, Kusaka only sees her as his possession and not as a human being, holding an extremely twisted "love" for her and even going so far as to rape her in the non-canon novel adaptation.

Despite this, Kusaka is extremely charismatic and excels at getting people to like and trust him. Even after his death, Mari and Keitaro still didn't realize the full extent of his sociopathy. Kusaka is also a cunning manipulator, skillfully playing people against each other such as when he ruined the friendship between Takumi and Yuji Kiba.

His most defining trait is his hatred for Orphnochs, it is so fanatical beyond belief to the point he even sees other benign Orphnochs (such as the aforementioned Yuji Kiba or Takumi after he revealed to be one) as his prey.

Kamen Rider Zi-O is the only instance where Kusaka is not entirely bereft of sympathetic qualities. Due to the time paradox caused by the creation of Another Faiz, along with the said Another Rider trying to keep his significant other (Karin Yamabuki) alive - as both of them were his classmates in the Ryusei School, he is more willing kill the said girl out of mercy to relieve her of the life imposed to her by Another Faiz.

However, this doesn't change his hostile relationship between him and Takumi.


  • So far, Kusaka is the only Secondary Rider in the Heisei Era to remain an antagonist and never befriend with the Primary Rider and only remained hostile towards them throughout his respective series. As the Second Rider tradition start off as anti-heroes before warming up to the main character(s).
  • In spite of being a non-canonical novel counterpart, Kusaka's portrayal as a rapist in Kamen Rider 555: Grotesque Flowers novel had disturbed many reader, and his rape towards Mari is largely considered to be one of the most infamous scenes written by the series' writer Toshiki Inuoe. As such, the writer was largely criticized by many fans (even including Kusaka's detractors) for portraying Kusaka in an even more repulsive tone than his already controversial main series counterpart.
  • A internet meme holiday called "Kaixa Day" is celebrated every September 13 - the date is a play on Kaixa's transformation keycode [9-1-3].

See also

External links


           Faiz Logo.png Villains

Smart Brain
Kyoji Murakami | Smart Lady | Eiichi Toda | Yuji Kiba | Riotroopers

Lucky Clover
Kitazaki | Saeko Kageyama | Itsuro Takuma | Mr. J | Aki Sawada

Stingfish Orphnoch | Elephant Orphnoch | Ox Orphnoch | Mantis Orphnoch | Cactus Orphnoch | Owl Orphnoch | Scarab Orphnoch | Snail Orphnoch | Equisetum Orphnoch | Flyingfish Orphnoch | Armadillo Orphnoch | Toadstool Orphnoch | Scorpion Orphnoch | Worm Orphnoch | Sea Cucumber Orphnoch | Rabbit Orphnoch | Frog Orphnoch | Stinkbug Orphnoch | Swordfish Orphnoch | Rhinoceros Beetle Orphnoch | Stag Beetle Orphnoch | Octopus Orphnoch | Pigeon Orphnoch | Barnacle Orphnoch | Okra Orphnoch | Sloth Orphnoch | Frilled Lizard Orphnoch | Bat Orphnoch | Coral Orphnoch | Arch Orphnoch

Masahiko Minami | Masato Kusaka | Naoya Kaido

Leo | Butterfly Orphnoch | Longhorn Orphnoch | Giraffe Orphnoch | Pelican Orphnoch | Wild Boar Orphnoch | Slug Orphnoch | Mole Orphnoch | Moose Orphnoch | Lion Orphnoch | Elasmotherium Orphnoch | Mizuhara | Wirepullers of Smart Brain

           Zi-O Logo.png Villains

Time Jackers
Swartz | Uhr | Ora | Tid | Finis

Another Riders
Another Build | Another Ex-Aid | Another Fourze | Another Faiz | Another Wizard | Another OOO | Another Double | Another Den-O | Another Kuuga | Another Gaim | Another Ghost | Another Shinobi | Another Quiz | Another Ryuga | Another Kikai | Another Zi-O | Another Blade | Another Agito | Another Ryuki | Another Hibiki | Another Kiva | Another Kabuto | Another Den-O II | Another Drive | Another Decade | Another Zero-One | Another 1 | Another Diend

Oma Zi-O's Army
Oma Zi-O | Woz | Kasshin | Dai Mazines

Future Riders
White Woz | Kamen Rider Ginga

Legendary Riders
Masato Kusaka | Kaito Kumon | Tsukasa Kadoya | Hajime Aikawa | Daiki Kaito | Shun Kageyama | Katsumi Daido

Another World Riders
Kamen Rider G4 | Kamen Rider Fuma | Kamen Rider Dark Ghost | Kamen Rider Rey | Kamen Rider Eternal | Kamen Rider Woz | Kamen Rider Yuuki

Kamen Rider Barlckxs | Kagen | Jogen | Woz | Kasshin | Dai Mazines

Tid's Army
Masquerade Dopants | Waste Yummies | Stardust Ninja Dustards | Elementary Inves | Ghouls | Lost Number Roidmudes | Gamma Commandos | Guardians | Hard Guardians

Swartz's Army
Monsters: Strong Smash Hazard | Mashin Chaser | Elementary Inves | Orion Zodiarts | Shika Inves | Utopia Dopant | N-Daguva-Zeba | Sagittarius Zodiarts | Gamedeus | Kamen Rider Evol
Footsoldiers: Guardians | Masquerade Dopants | Elementary Inves | Lost Number Roidmudes | Ghouls | Gamma Commandos | Bugster Virus

Salis Worms | Gryllus Worm | Imposter Shun Kageyama

Waste Yummies | Gamma Commandos | Humanoise | Mole Imagin | Narutaki

Rider Time Shinobi
Niji no Hebi
Yaminin | Stardust Ninja Dustards

Rider Time Ryuki
Tatsuya Kano | Takeshi Asakura | Jun Shibaura | Dark Shinji | Ishihashi | Tozuka | Kamen Rider Odin