[1] In the film, Tadashi, a student at the San Fransokyo Institute of Technology, is the creator of Baymax, and the older brother of Hiro Hamada.

He actually developed, built and programmed a state-of-the-art nursebot—a Healthcare Companion named Baymax that will likely help millions worldwide.

Initially, Hiro dismisses the request, as he chooses to pursue monetary gain from his domination in illegal bot fights in San Fransokyo, even in spite of any risks.

[3] The experience inspires Hiro to want to attend the school himself, and, with a small amount of help from Tadashi, he begins working on his own endeavor in order to gain admission.

[8][11] Hiro showcases his project, Microbots, controlled by a neurological headband and highly versatile, at a student exhibition held at the school.

In "Failure Mode", it is revealed that he nearly gave up on completing him[17] and he needed a medical expert named Lily in order to properly program him, as seen in "City of Monsters – Part I".

[1][22] A review by Manohla Dargis of The New York Times describes that Tadashi "isn't much better" than the "disappointingly bland maternal creation," Aunt Cass.

[23] In her review, Dargis states that this is despite Tadashi being a "hunky brainiac who studies at an institute of higher nerdiness alongside a Scooby Doo-like posse.

"[23] The Japan Times describes that Tadashi "fits the normal Hollywood bill of a polite young Japanese male".

[5] At one point in his review, Sam Adams of Indiewire's "Criticwire" blog, writes that Tadashi has a "nurturing spirit".