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Tadashi Hamada is Hiro Hamada's beloved older brother and a major character in the Disney animated film Big Hero 6. A incredibly gifted robotics student at the San Fransokyo Institute of Technology, Tadashi is the creator of Baymax, the world's first nursebot. Tadashi's tragic and mysterious death in a fire catalyzes the events of Big Hero 6, leading Hiro Hamada and Tadashi's friends to band together to investigate the cause of the accident.

Official Disney Bio

 * Tadashi was a good guy. He just is. He actually developed, built and programmed a state-of-the-art nursebot—a Healthcare Companion named Baymax that will likely help millions worldwide. But it's his role as big brother that makes Tadashi truly special. Every kid needs a guy like Tadashi looking out for him, and Hiro knows just how lucky he is to have him in his life.

Development
In the original Big Hero 6 comic series, Tadashi did not exist, and Hiro was the one to create Baymax; he is original to the film. It is possible that his role was filled and inspired by Hiro's father in the comics, Tomeo Takachiho, who passes away, prompting Hiro to create Baymax to fill the void left behind in his heart.

In concept art, he had a slightly more Japanese appearance.

Personality
Tadashi is described as the kind of guy every kid needs to look after them. Light-hearted, kind, and incredibly selfless, he is well-liked by peers and family members alike. A great older brother, he is always there when Hiro needs him, even when Hiro doesn't want to admit that he does. He has a warm sense of humor and a energetic, optimistic personality. He loves to tease his brother, although never to an extent that truly hurts him. He likes to be silly as well, doing things like making fist bumps with mock explosion noises. He appears to be excitable as well, yelling and panicking happily when Baymax boots up for the first time.

Despite his kind personality, he is not above becoming angry or frustrated, especially when Hiro does things that are wasting his life and putting himself in danger, and is quick to scold.

Tadashi is incredibly gifted as far as intellect goes, and is studying in the robotics program at the most prestigious university in San Fransokyo, led by Professor Callaghan. He also has a large imagination that enables him to work well with robots, similar to his brother. He also has quite an understanding of health and medical procedures, as he was able to compile over 10,000 procedures to download into Baymax. Tadashi is also a hard worker; successfully balancing his rising career in robotics and providing moral support for his younger brother Hiro, keeping a smile and good attitude while doing both. He doesn't believe in "dead ends", and never gives up, continuing to do test runs on Baymax nearly 100 times, until it started up correctly.

Tadashi loves his family very much, and wants for them to be happy. He hates making his aunt Cass upset, and appreciates all that she has done to raise him and Hiro, especially having done it alone. His aunt and his little brother's happiness, health, and safety are among the most important things in his life. He finds also importance in other peoples's health and well-being, creating Baymax with the sincere hope that it would help alot of people. He has made it clear that he is always willing to protect people --- even at the cost of his own life.

=== Physical Appearance===

Tadashi is an attractively tall, slender, moderately muscular young adult male. He is of mixed Japanese and Caucasian descent, which shows in his various facial features. He has large brown eyes and neat black hair, cut above his prominent ears. His face shape is different from his aunt and brothers, with a longer face, larger jaw, and slightly larger nose.

His clothing changes daily, but owns many similar articles of clothing, only varying in color, such as several blazers, crew neck t-shirts, and cardigan sweaters. He also often wears mint-colored sneakers with white soles and shoelaces.

A notable physical trait is his preference for a black baseball cap with a red-and-gold San Fransokyo Ninja lettering on it. He almost never takes this cap off, except when doing tech presentations or speeches, as well as in family photos.

On the day of the Tech Showcase at SFIT, he wears an olive green blazer over a black shirt, with brown jeans, rolled up around his ankles.

Early Life
Tadashi and Hiro was born the oldest of two children to unnamed parents who died ten years before the events of Big Hero 6, leaving them in the care of their aunt, Cass Hamada. They grew up together in the second floor apartment of Cass' cafe and bakery, the Lucky Cat Cafe. As the only person Hiro could relate to, Tadashi became his role model and best friend, nurturing his interest in science and robotics.

Eventually, Tadashi graduated high school and was accepted to the San Fransokyo Institute of Technology, while Hiro graduated high school early at age 13. Instead of attempting to apply to SFIT to attend with Tadashi, he decided to use his intelligence to create robots to participate in underground bot-fighting, much to Tadashi's dismay.

Printed Material
Tadashi has appeared in a few book related to Big Hero 6, including novelizations, colouring books and manga. The prequel manga, Baymax, describes Hiro and Tadashi's childhood.

He is also the center of the book, Hiro and Tadashi, alongside his brother. The book gives more insight into the Hamada brothers' closeness and the importance the relationship has on Hiro, as they build an "awesome robot" for Professor Callaghan's class.

Hiro Hamada
Hiro is Tadashi's little brother, and likely the most important person in Tadashi's life. They've shared a bedroom presumably since they moved in with Cass 10 years ago, allowing Tadashi to always be there when Hiro needs him, academically or emotionally. Because they were raised together, no one knows Hiro's emotions and issues better than Tadashi, and vice versa. Tadashi was also the one who encouraged Hiro to be interested in robotics, and they are seen assembling a robot toy together in a family photo, as children.

Hiro's health, happiness and wellbeing is of utmost importance to Tadashi, and he is disappointed when Hiro continues to bot-fight underground instead of trying to do something productive with his incredible intelligence. He not-so-subtly persuades Hiro to apply to SFIT and pursue a career in robotics alongside him, and is tremendously proud when Hiro succeeds.

Tadashi's death devastates Hiro, leaving him unable to eat and unwilling to cooperate socially for weeks.

Cass Hamada
Cass is Tadashi's over-worked but loving aunt. She has raised them for a decade since their parents died, although she admits she's not perfect. He hates making her upset, and tries his best to make her proud, encouraging Hiro to do the same.

Trivia

 * Judging by the objects in his area of his and Hiro's bedroom, he appears to like surfing, as he keeps a surfboard.
 * It took him 84 tests to get Baymax to boot up properly.