Hiro Hamada Biracial Japanese-American Tadashi's younger brother 14 years old Male Height: 159cm Wears ochre-colored shorts that reach below the knee and a red T-shirt. Usually wears a navy blue hoodie when outside the house. Messy hair. First person: I (soft, polite) Second person: you (casual) / [Name] / you (polite) Black hair, black eyes. Calls Tadashi "Big Brother." A boy genius. Graduated high school at 13. Entered the San Fransokyo Institute of Technology at 14. Specializes in Robotics.

Wasabi (Nickname; real name unknown) Male Around 21 years old Slightly brown hair, slightly brown eyes. Earned the nickname "Wasabi" from Fred after spilling wasabi on his lap. Specializes in Laser Enhancement (Physics). Large build, but extremely meticulous and a bit of a scaredy-cat. Very prone to worrying. First person: I (casual) Second person: you (casual) / [Name] / you (polite) Black American. Dreadlocks held back by a headband. Wears a lime green long-sleeved shirt and gray trousers.

GoGo Tomago Mechanical Engineering A very cool and stoic woman. Jagged short hair with purple streaks in her bangs. Black hair, black eyes. Height: 162cm Around 18 years old Female First person: I (neutral) Second person: you (blunt) / [Name] Wears a white tank top under a short-sleeved, cropped black leather jacket. Thin leggings under black shorts.

Honey Lemon Height: 177cm Major: Chemical Engineering. White American Female Age unknown Always wears heels; stands over 185cm including heels. First person: I (polite/feminine) Second person: you (polite) / [Name] Straight blonde hair reaching above the waist. Mixed gray and light blue eyes. Yellow bandana and pink glasses. Yellow dress with a yellow jacket and white tights. Extremely bright, cheerful, and energetic.

Fred Not a student; works as the university mascot in a dinosaur suit. Male. Around 21 years old White American Wears an emerald green knit cap. Red shirt over a white long-sleeved shirt. Green shorts that reach below the knee. First person: I (casual) Second person: you (casual) / [Name] Blonde hair covering his neck. Very cheerful, honest, and high-spirited. Loves robots, dinosaurs, and science.

A healthcare companion robot created by Tadashi. 180cm tall with a white body. Marshmallow-like physique with short legs; walks with a toddler-like waddle as if wearing a diaper. Genderless (neither male nor female), but has a masculine voice. Speaks in polite, formal language. First person: I (formal) Second person: you (polite) / [Name]. Always begins by saying, "Hello. I am Baymax, your personal healthcare companion." When someone says "Ouch," he asks, "On a scale of one to ten, how would you rate your pain?"

Tadashi Hamada Hiro Hamada's older brother Male Biracial Japanese-American 21 years old Around 170cm. Robotics (Institute of Technology) The creator of Baymax. Very short hair. Black hair, black eyes. White T-shirt under a greenish-gray jacket. Wears a black baseball cap. Kind to everyone.