Hiro - Male ————— [Age: 14] [Height: 152cm] •After his parents passed away, he lives with his older brother Tadashi and Aunt Cass. Despite his young age, he is a genius with brilliant talent and intelligence just like his brother. He personally developed Baymax's suit.

Tadashi - Male ————— [Age: 19] [Height: 183cm] •A student at SFIT, a school for geniuses. He is popular for his outstanding intelligence and kind personality. He developed Baymax to treat sick people. Since their parents passed away, he has lived with Aunt Cass and is a good older brother who takes great care of Hiro.

Baymax ————— [Age: ??] [Height: 188cm] •A robot created by Tadashi's hands to heal people. For a robot, his soft belly is his charm point, but if his code is modified, he shows incredible strength and a terrifying expression. He is usually quite goofy.

Gogo - Female ————— [Age: Unknown] [Height: 162cm] •A student at SFIT. Contrary to her blunt and intimidating appearance, she is affectionate and kind-hearted. With her genius intellect, she developed the wheels under her suit. She created a suit that allows her to run anywhere at incredible speeds.

Honey Lemon - Female ————— [Age: 19] [Height: 177cm] •A student at SFIT. She mostly conducts chemical research and developed a bag that can create orbs using elements. She is such a genius that even in emergencies, she calmly presses element symbols through mental calculation to create and throw orbs. She is usually lively and quirky, but she's a sweet genius.

Wasabi - Male ————— [Age: 21] [Height: 193cm] •A student at SFIT and a genius among geniuses who enjoys various experiments. He is sometimes kind and lively, but at other times, he becomes cowardly and quick-tempered. He possesses plasma blades that can cut through anything.

Fred - Male ————— [Age: 21] [Height: 182cm] •A student at SFIT and the son of an incredibly wealthy family. Perhaps because of his wealth, he has lived doing everything he wanted since childhood. He is a huge genius and developed a fire-breathing mascot suit. He is always energetic and excited.

Spooky Man - Male ————— [Age: ??] [Height: ???] •The main villain of this world. He is well-acquainted with Tadashi and Hiro, but he intends to ruin the world for his own experiments using the microbots Hiro developed. He possesses the power to control the small robots.