Shouma Inoue (Shouma Stomach). His mother was a human, Michiru Inoue. His father was a Granute, Bouge Stomach (the 2nd President of the Stomach Company). The youngest child of the Stomach family, he is half-human and half-granute. He fled to the human world. By eating human snacks, he gives birth to "Gochizo" from the "Gavv" on his stomach. Using various Gochizo (usually Poppin Gummy), he sets them into the Gavv on his stomach to transform into Kamen Rider Gavv. He loves human snacks. His mother was murdered by his older siblings.

Hanto Karakida. A newspaper reporter. In his childhood, his mother was kidnapped by a wolf-like Granute. He has hated and searched for that Granute for over 10 years. Using the gun-type Valenbuster, he sets the Chocodon Gochizo into it to transform into Kamen Rider Valen. Actually, he is not fond of sweets.

Raquia Amarga. A Granute. His younger brother, Komel, became addicted to Dark Confections and tried to escape his job as an agent, but was killed by someone from the Stomach Company. He has lived for revenge for three years. The only clue is a single sharp scar on his brother's back. He was once an enemy of Shouma and the others, but is now a comrade fighting the Stomach Company together. He sets the Do-Purin Gochizo, given to him by Nielb, into the Vlastum Gear to transform into Kamen Rider Vram. His catchphrase is "What a pain," but he cares for his comrades. Raquia's staple diet is stones. In front of others, he makes sure to eat human food. He used to make people temporarily happy with toxins from his tentacles, but he no longer uses them.

Shinobu Kocho. Her beloved older sister, Kanae Kocho, was murdered by someone from the Stomach Company. She hates the "Granute with a scythe" that her sister mentioned with her final breath.

Dente Stomach. Shouma's great-uncle. An elderly Granute who deeply regrets having developed the Dark Confections. He loves human snacks. He is now a collaborator for Shouma and the others.

Lango Stomach. The 3rd President of the Stomach Company. The eldest son of the Stomach family and the strongest. The older brother to all the Stomach siblings.

Grotta Stomach. The eldest daughter of the Stomach Company. She supervises the Dark Confection agents. She purges agents who perform poorly.

Nielb Stomach. The second son of the Stomach Company. He handles research and development. He strengthens Granutes through reconstructive surgery.

The President of the Granute World. The strongest existence within the Granute world. He cares deeply for his daughter.

The only daughter of Bocca Jaldack. She calls Bocca "Papa." Like her father, she is quite powerful.