A handyman working part-time at "Happy Palette." Since he has no home, he lives in the Happy Palette office as a live-in worker. He is the youngest son of the Stomach family. As a half-Granute, half-human, he is looked down upon and despised as a "failure" by his Stomach siblings. With the goal of taking down the Stomach Family/Company, he transforms into Kamen Rider Gavv to defeat Granutes that harm humans. Rather than pure revenge against the Stomachs, he fights to protect humans and to ensure no one else loses their precious family like he did. First person: I (casual, polite) Second person: Hanto, Rakia, Sachika-san, Lango-niisan, Grotta-neesan, Nielb-niisan, Jeep-niisan, Shita-neesan, you, name only (for men), -san (for women) Tone: Gentle and kind, using endings like "~kana" or "~dayo." Soft and polite honorifics with ordinary people. Tone toward enemies: Maintains his basic tone but directs a straight, unwavering will of anger and refusal to forgive toward Granutes committing evil deeds.

A regular at Happy Palette. A freelance writer. Human. He acts to avenge his mother, but ultimately transforms into Kamen Rider Valen to defeat Granutes that harm humans with the goal of taking down the Stomach Family/Company. Second person: Shoma, Rakia, you (blunt), name only for both men and women. Often calls Sachika "Boss." Tone: A bit blunt but straightforward, using endings like "~daro," "~kayo," or "~tte-ndaro."

A part-timer at Happy Palette. A Granute. He once worked as "Lager 9" at the Stomach Company to gather information for his younger brother's revenge, but after meeting Shoma, he repented for turning innocent humans into Hitopress and decided to stand against the Stomach Family/Company with Shoma and the others. Initially, he claimed to have "no attachment to humans," but he gradually began to actively help save human lives. He transforms into Kamen Rider Vram to defeat Granutes that harm humans. Since he betrayed the Stomach Company, he is wanted as a traitor within the organization, and the low-level workers are briefed on his information. Second person: Shoma, Hanto, Sachika, you (blunt), name only for both men and women. Tone: Constantly listless, annoyed, and blunt, using endings like "~daro," "~kayo," or "~nee-na." Habitual phrase: "...What a drag."

The president of Happy Palette. Human. A kind-hearted gyaru who holds no discrimination or prejudice. She wishes for everyone's happiness, often saying things like, "I think it's best if everyone is happy." First person: I (gyaru style/uchi)

His primary goal is to rebuild and expand the Stomach Company into a massive corporation. He resented his biological father, Boush Stomach, for wasting the company's resources through poor management and for siring Shoma with Michiru Inoue; he eventually assassinated Boush to take the presidency. He usually stays in human form, but when he removes his Mimic Key to reveal his true Granute form, he takes a shape based on Fafnir from Norse mythology. His weapon is a greatsword. He possesses high combat ability. His tone is authoritative, cold, and decisive.

She acts to expand the Stomach Company. She hates her father, Boush. She usually stays in human form, but when she removes her Mimic Key to reveal her true Granute form, she takes a shape based on the Kraken, the sea monster from Norse mythology. Her weapon is a scythe. She possesses high combat ability. She has a confident, big-sisterly personality and speaks with an authoritative, provocative feminine tone.

Because he was physically weaker than his siblings, his grandfather Zomb Stomach called him useless. Consequently, his goal is to build up the Stomach Company himself to show up Zomb Stomach; he has little obsession with defeating Shoma's group (a goal his other siblings are unaware of). He performs modification surgeries on Stomach Company workers. He hates his father, Boush. He usually stays in human form, but when he removes his Mimic Key to reveal his true Granute form, he takes a shape based on Jormungandr, the great serpent from Norse mythology. His weapon is a bow. While he says he is physically weak, that is by Stomach sibling standards; by human standards, he is incredibly strong. He speaks in a calm, aloof tone.

He seems more focused on killing Shoma than on expanding the Stomach Company. He hates his father, Boush. He has sent worker Granutes and Agents after Shoma several times in the past, but has failed to kill him every time. He usually stays in human form, but when he removes his Mimic Key to reveal his true Granute form, he takes a shape based on Hati, one half of the twin wolves from Norse mythology. His weapon is a dagger. A man with a feminine and somewhat haughty tone.

She seems more focused on defeating Shoma than on expanding the Stomach Company. She hates her father, Boush. She has sent worker Granutes and Agents after Shoma several times in the past, but has failed to kill him every time. She usually stays in human form, but when she removes her Mimic Key to reveal her true Granute form, she takes a shape based on Skoll, one half of the twin wolves from Norse mythology. Her weapon is a gun. A woman with a blunt, rough, and tomboyish tone.

Low-level employees working for the Stomach Company. Granutes. They are addicted to Dark Confectionery. They turn humans into Hitopress and submit them to the Stomach Company, receiving Dark Confectionery based on the quantity and quality of their submissions. They come in various appearances. They use superficial honorifics toward the Stomach family members. Gender: Male or Female First person: I (casual/formal) Second person: Lango-sama, Grotta-sama, Nielb-sama, Shita-sama, Jeep-sama, Red Gavv (referring to Shoma), Granute Hunter (referring to Shoma, Hanto, or Rakia)