is a Japanese tokusatsu series that is the 35th installment in the Kamen Rider franchise and the sixth entry in the Reiwa era.
Main characters Shoma is a human-Granute hybrid and former member of the Stomach Family who turned against them after they killed his human mother Michiru, including Hanto's mother Sae, when he discovered the truth behind his family's conspiracy. Upon arriving in the human world, he renames himself to honor the memory of his mother and vows to protect humanity from his former family and the Granutes who worked for them. Over the course of the series, he finds the only two family members who support him; his paternal granduncle Dente and his maternal uncle Masaru. Three months after the deaths of his siblings and Bocca Jaldak, Shoma starts developing to cure stranded former part-time Stomach employees from the Dark Treats' addictions, making said confection edible to both humans and Granutes alike without any side effects.
Utilizing the Poppingummy Gochizo in conjunction with his modified belt-like Gavv, also known as the , attached to his abdomen, Shoma can transform into Kamen Rider Gavv . While transformed, he is clad in viscoelastic regenerative armor. He also wields the sword, which allows him to perform feint attacks by firing Gochizo loaded in the vehicle-like projectile. His personal vehicle is the ATV, which is summoned from the Vrocan Gochizo and can be reconfigured into either an alternate motorcycle mode or the double-barreled cannon. Additionally, he can assume a variety of forms and/or their enhanced versions using other Gochizo, which are as follows: : An enhanced version of Poppingummy Form accessed from the Kickingummy Gochizo that equips Shoma with the sabaton. : An auxiliary form accessed from the Zakuzakuchips Gochizo that grants proficiency in sword fighting. In this form, Shoma dual wields the twin regenerative scimitars. : An enhanced version of Zakuzakuchips Form accessed from the Hirihirichips Gochizo that grants pyrokinesis. : An enhanced version of Poppingummy Form accessed from the Punchingummy Gochizo that equips Shoma with the gauntlet. This form first appears in the film Kamen Rider Gotchard: The Future Daybreak. : An auxiliary form accessed from the Fuwamallow Gochizo that grants bouncing and levitation capabilities. However, the mitten-like hands make it difficult for Shoma to grab objects and the armor will melt if subjected to high heat. : An enhanced version of Marumallow Form accessed from the Marumallow Gochizo that grants shapeshifting capabilities. : An auxiliary form accessed from the Chocodan Gochizo that grants proficiency in sharpshooting. In this form, Shoma wields the . However, the armor will melt if exposed to high temperatures. : An enhanced version of Chocodan Form accessed from the Chocodon Gochizo that grants the use of the to dual wield alongside the Chocodan Gun. : An auxiliary form accessed from the Gurucan Gochizo that clads Shoma in a heatproof exosuit. In this form, he wields the Vrocan Gatling. : An enhanced version of Gurucan Form accessed from the Bakucan Gochizo that equips Shoma with the twin shoulder-mounted . : An auxiliary form accessed from the Bushel Gochizo that grants chlorokinesis. In this form, Shoma wields the battle axe. : An enhanced version of Poppingummy Form accessed from the Kickingummy and Punchingummy Gochizo that equips Shoma with the Range Kicking and Shuwa Punching. : An upgrade form accessed from the Caking Gochizo that grants photokinesis. In this form, Shoma wields the pastry bag-like lance, which allows him to summon a pair of humanoid servants each wielding a spear for combat assistance. He can also augment the Whipped Soldiers with the abilities and/or weaponry of his preexisting forms via their corresponding Gochizo. However, prolonged use of this form will consume Shoma's energy, causing him to starve once he cancels his transformation. : Shoma's super form accessed from the Blizzardsorbei Gochizo that grants cryokinesis and the use of varying abilities. In this form, he can wield the Gavvwhipir if the Blizzardsorbei Gochizo was created by consuming ice cream cake, allowing him to summon a pair of enhanced for combat assistance. However, Shoma can only use this form for a certain amount of time before the Blizzardsorbei Gochizo melts and forcefully cancels his transformation. : An evolution of Poppingummy Form accessed from the Amazingummy Gochizo that grants thermokinesis. : A special form accessed from the Kungfu Ramen Gochizo that grants proficiency in Chinese martial arts. In this form, Shoma is equipped with a buckler. This form appears exclusively in the Hyper Battle DVD special Kamen Rider Gavv: Gourmet Snacks and Woo!-mai Wakamen!!. : An enhanced version of Shield Snack Form accessed from the Choco Treasure Gochizo that grants the ability to morph Shoma's buckler into a nunchaku. This form appears exclusively in the Hyper Battle DVD special Kamen Rider Gavv: Gourmet Snacks and Woo!-mai Wakamen!!. : A special form accessed from the Partea Scone Gochizo. This form appears exclusively in the stage show Kamen Rider Gavv: Strange Sweets Tea Party. : A special form accessed from the eponymous Gochizo that grants the combined powers of Shoma's preexisting Gochizo. In this form, he wields the serrated sword. This form appears exclusively in the film Kamen Rider Gavv: Invaders of the House of Snacks. : A special form accessed from the Kin Choco Gochizo. In this form, Shoma dual wields a pair of handguns that resemble the Chocodan Gun. This form appears exclusively in the Ishikawa Prefecture version of the stage show Kamen Rider Gavv: Final Stage. : A special form accessed from the Tako Sen Gochizo that grants a pair of cephalopod limbs. This form appears exclusively in the Osaka Prefecture version of the stage show Kamen Rider Gavv: Final Stage. : A special form accessed from the Men Sen Gochizo. In this form, Shoma wields a kanabō. This form appears exclusively in the Fukuoka Prefecture version of the stage show Kamen Rider Gavv: Final Stage. : A special form accessed from the Uirou Gochizo. In this form, Shoma dual wields a pair of tonfa. This form appears exclusively in the Aichi Prefecture version of the stage show Kamen Rider Gavv: Final Stage. : A special form accessed from the Ningyo Gochizo. In this form, Shoma wields a katana. This form appears exclusively in the Tokyo version of the stage show Kamen Rider Gavv: Final Stage.
Later in the series, Shoma acquires the jar-like device, which allows him to assume one of his two final forms. However, it can only function by absorbing 100 Gochizo and must be refilled after each use. : Shoma's orange-colored final form accessed from the Gochipod's mode that increases his physical strength to its fullest potential at the cost of running speed and clads him in elasticized armor. In this form, he is equipped with a pair of gauntlets. : Shoma's purple-colored final form accessed from the Gochipod's mode that increases his running speed to its fullest potential at the cost of physical strength and grants the ability to summon any of his preexisting forms' weapons. In this form, he is equipped with a pair of sabatons.
Shoma is portrayed by . As a child, Shoma is portrayed by .
Hanto Karakida is a freelance writer investigating Shoma and the Granutes. He was orphaned at a young age, having lost his mother Sae to the hands of Stomach Inc. when he and Shoma were children, and his grandmother died sometime afterwards. In high school, he was taken under Shioya's wing and became his assistant. After being implanted with a Granute organ by Suga, Hanto gains the ability to transform into . After the final battle, he begins to publish the existence of Granutes and Dark Treats in response to the surviving former Stomach Inc.'s part-timers and Lizel Jaldak.
In an alternate universe depicted in the film Kamen Rider Gavv: Invaders of the House of Snacks, Hanto works as a food delivery rider.
Utilizing the Chocodon Gochizo in conjunction with the firearm, Hanto can transform into Kamen Rider Valen . While transformed, he gains superhuman athleticism. Additionally, he can assume a variety of forms using other Gochizo, which are as follows: : An auxiliary form accessed from the Doumaru Gochizo that equips Hanto with the twin forearm-mounted expandable . Bushel Form: An auxiliary form accessed from the Bushel Gochizo that grants similar capabilities as Shoma's version. : An upgraded version of Chocodon Form accessed from the Chocold Gochizo that increases the capabilities of the original form. However, using the Chocold Gochizo to transform is progressively lethal.
Later in the series, Hanto acquires his own Vrastum Gear, which allows him to assume the following forms: : Hanto's final form accessed from the Frappeis Gochizo that grants cryokinesis and the use of the Chocodon Gun to dual wield alongside the Valen Buster. However, like Shoma's Blizzardsorbet Form, he can only use this form for a certain amount of time before the Frappeis Gochizo melts and forcefully cancels his transformation. : A special form accessed from the Chocorappa Gochizo that grants ergokinesis. This form appears exclusively in the V-Cinema Kamen Rider Gavv: Guilty Parfait.
Hanto Karakida is portrayed by . As a child, Hanto is portrayed by .
Sachika Amane is the CEO of the jack of all trades shop where Shoma works and lives. She uses her connections on social media to help Hanto with his work, and later to help the Riders protect humans from Stomach Inc., especially after Shoma tells her the truth about himself.
Sachika Amane is portrayed by .
Rakia Amarga , code-named , is a jellyfish-themed Granute miner who lost his younger brother Comel due to Dark Treats, leading the latter to be murdered by Glotta. Upon being hired by Lango as punishment for attempting to steal Dark Treats from a nearby available stall and secretly planning to destroy them, Rakia uses this opportunity to destroy Stomach Inc. from the inside while regretfully serving as their part-timer for the time being. He possesses the ability to generate energy tentacles that can paralyze his victims into euphoric states, allowing him to capture several humans all at once. When he was briefly promoted by Nyelv from part-timer to enforcer, before his true intention to destroy Stomach Inc. is exposed, Rakia gains the ability to transform into . One month after Suga's defeat, Rakia occupies the scientist's former hideout as his new permanent home. During the final battle, he decides to return to his home world and destroy the interdimensional gates that connect the two worlds while sending his Doppudding and Purujelly Gochizo to live in the human world. After the restoration of one of the interdimensional gates, he decides to watch the gate.
In an alternate universe depicted in the film Kamen Rider Gavv: Invaders of the House of Snacks, Rakia properly works part-time at Stomach Inc.
In a "what-if" alternate timeline separate from the events of the series and depicted in the web-exclusive special Kamen Rider Vram: Route Stomach, Rakia avenges Comel's death at the cost of his own life.
Utilizing the Doppudding Gochizo in conjunction with the belt, Rakia can transform into Kamen Rider Vram . While transformed, he wields the , which can switch between and . He also retains his energy tentacles, which he can use as a weapon. Additionally, he can assume a variety of forms using other Gochizo, which are as follows: : An auxiliary form accessed from the Purujelly Gochizo that grants invisibility. However, using this ability is potentially fatal, as it will cause Rakia's heart to stop beating while in effect. : Rakia's final form accessed from the Puddinte Gochizo that clads him in metallic armor and grants ferrokinesis. In this form, he wields the shield.