<P> Tadashi appears in Big Hero 6 as Hiro's older brother . Due to their parents being deceased, Tadashi is Hiro's primary voice of reason and father figure . In the film, Tadashi and Hiro live in San Fransokyo with their aunt Cass . Although his age is not explicitly described in the film, Tadashi acts very mature for his age . Additionally, Henney describes the character as "pure", even comparing Tadashi to an angel . Tadashi is also a "tech - wizard" who conceives, builds and programs Baymax . </P> <P>--Official Disney blog release (2014). </P> <P> In the film, Tadashi suggests that Hiro attends the San Fransokyo Institute of Technology as Hiro, like Tadashi, is gifted in robotics and engineering, his intellect allowing him to graduate from high school at 13 . Initially, Hiro dismisses the request, as he chooses to pursue monetary gain from illegal bot fighting . However, Tadashi is able to redirect Hiro's intelligence, giving him a tour of the institution that allows him to see how remarkable it really is, and introduces him to his friends - Honey Lemon, GoGo, Wasabi, and Fred . Tadashi also introduces Hiro to his project Baymax, a personal healthcare robot . Tadashi designs Baymax to have a huggable build . The film's animation team researched at Carnegie Mellon University to help conceive Baymax's design . Directors Don Hall and Chris Williams wanted Baymax to be "appealing but also huggable ." Ryan Potter (Hiro's voice actor) states that Hiro sees Baymax as a representation of Tadashi . The tour inspires Hiro to want to attend the school himself, and he begins working on his own endeavor in order to gain admission . Hiro showcases his project, Microbots controlled by a neurological headband, at an exhibition held at the school . Shortly after being accepted by Robert Callaghan, the institute's professor, the exhibition hall catches fire . With Professor Callaghan still inside, Tadashi runs into the burning building in an effort to save him . Moments later, the building explodes, killing Tadashi and as everyone else assumes, Callaghan . Hiro, Baymax, and Tadashi's school friends mourn Tadashi throughout the rest of the film, while most of his legacy remains present in the form of Baymax . Following Tadashi's death, Baymax ends up taking over the role of being Hiro's emotional support . A series of further events leads to the formation of the superhero team Big Hero 6, who investigate Tadashi's death and the criminal plot that surrounds it, and honor Tadashi through continuing as a team to fulfill his dedication of helping people . Prior to the film's climax, Baymax shows video footage of his testing by Tadashi to Hiro, revealing that it took Tadashi several dozen attempts to perfect Baymax's original programming . Portions of these tests are seen in the second official US trailer of the film . </P> <P> In the Korean version of the film, Tadashi's name, which is of Japanese origin is changed to "Teddy". </P>

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