Tadashi Hamada is Hiro Hamada's older brother and a major character in Disney's 2014 animated feature film, Big Hero 6. A gifted robotics student at the San Fransokyo Institute of Technology, Tadashi is the creator of Baymax, the robotic Personal Healthcare Companion. He is voiced by Daniel Henney. In MCF stories he at first plays the same role as he does in his debut though appearing as old childhood friends of Tracy and Tricia though in the MCF sequel it has Tadashi with a scar on his arm from the fire who became Yokai to get his revenge on Professor Callagahn for leaving him for dead.
One night, in the city's illegal underworld, Hiro engages himself in a bot fight against a group of thugs; specifically the boisterous Mr. Yama. After facing a humiliating defeat, Yama seeks revenge by ordering his goons to attack the young genius, who is immediately rescued by Tadashi, on his moped. The brothers make their escape (as Tadashi reprimands Hiro on his actions), only to find themselves caught and arrested by the San Fransokyo police. Fortunately, they're released on account of Cass, who scolds the two on the ride home. The incidents leaves Tadashi frustrated with Hiro's bot fighting obsession, and in hopes of sending him down a better path, takes his younger sibling to his school; the San Fransokyo Institute of Technology. There, Hiro meets Tadashi's closest friends, Tadashi's latest invention, Baymax, as well as Professor Callaghan; an aspiring master of robotics and Hiro's personal icon. The experience successfully manipulates Hiro into have a strong desire to attend the school.
To gain acceptance, Tadashi suggests Hiro participate in the school's annual science fair. Should his invention and presentation impress Callaghan, he'll be allowed enrollment. Unfortunately, Hiro reaches a creative rut, until Tadashi steps in and advises he looks from a different angle. Tadashi's advice leads to the creation of the Microbots. On the night of the fair, Callaghan shows amazement at the sight of Hiro's latest invention, leading to the latter's acceptance into the school. After the successful presentation, Tadashi congratulates his brother on his accomplishment, showing pride in the new path he's willing to take.
Just then, a fire breaks loose at the school, and Tadashi immediately rushes to action. Whilst most civilians managed to escape, Tadashi learns from a survivor that Professor Callaghan is still trapped inside the burning building. With no help around to save him, Tadashi volunteers his own life. A fearful Hiro immediately stops his brother, but reluctantly allows the decision upon seeing Tadashi's humanity and motivation to rescue his mentor. After rushing inside, the building violently explodes, killing Tadashi (even though his final moments are not shown, the junior novelization implies that he was crushed by a falling beam). After Tadashi's death, the people of San Fransokyo mourn his loss, whilst a heartbroken Hiro falls into depression.
Though mentioned several times in the events following his demise, Tadashi wouldn't appear again until after Hiro's anger and frustration consumes him, leading Baymax to show a series of footage (which was recording while Tadashi was in the process of building the healthcare companion) to comfort. In it, is it shown that Tadashi had spent multiple attempts testing and perfecting the robot, each time ending with a major failure. Although there were many major setbacks, Tadashi never gave up on building him. During the eighty-fourth test, Baymax was finally functional, causing Tadashi to express excitement for his success. With Baymax working properly, Tadashi stated his eagerness to now be able to help others with Baymax, especially when he would get to show Baymax to Hiro. Tadashi's inspiring words and loving ways throughout the footage successfully heals Hiro's damaged heart, and as such, the young prodigy vows to use his intellect to change the world for the better, which he does by defeating Yokai (the man responsible for Tadashi's death) and using the Big Hero 6 team to selflessly protect the city.
In the credits of the film, a ceremony of a building dedication in his name takes place, in which Hiro accepts the honor on his brother. The building is most likely to be a replacement for the one that was intentionally incinerated by Professor Callaghan during the convention, which also took Tadashi's life.
Incredibly kind, encouraging, and hard-working, Tadashi is considered the epitome of a great brother, nephew and student, always there when people need him. He has an energetic sense of humor and can be silly and excitable.
As mentioned above, Tadashi is very hard working and very intellectually gifted. He does not believe in "dead ends" and values hard work to accomplish goals. He also has a large understanding of health and medicine. Ever the optimist, he successfully balances this rising career in cutting-edge technology and providing moral and emotional support for his younger brother Hiro, all the while keeping a good attitude and a happy smile. He also even appears to be athletic, and he is known to have taught Hiro some karate; Baymax's statement that Tadashi was in 'excellent health' also indicates he is physically fit.
As the only male figure in Hiro's life, he has carried the burden of responsibility from a young age, knowing he had to lead Hiro and be a good role model. Having to care for Hiro alongside their aunt Cass has made Tadashi gentle and understanding, though as the big brother, he occasionally can still be rough. He is also not above scolding Hiro or becoming upset with him, angry at Hiro's unwillingness to try and make something of his life, showing a slightly frustrated side to his personality not seen anywhere else.
Tadashi also values his aunt; he does not like to make her upset, and is appreciative for all she has done to raise them, especially having done it alone. His concerns extend to the general public, developing Baymax with the sincere hope that the healthcare companion would help people all over the world. He is dedicated to helping others no matter what the cost is to him, a statement undeniably proven when he makes the ultimate sacrifice in an attempt to protect his teacher.
Tadashi is an tall, slender, slightly muscular young adult male, of a larger build than others in his family. He is of mixed Japanese and Caucasian descent, which shows in his various facial features. He has large, warm 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 most notable physical trait is his preference for a black baseball cap with a red-and-gold San Fransokyo Ninja lettering on it. He never takes this cap off, except when doing tech presentations or speeches, as well as in family photos.
Since his changes his clothes daily, he does not wear any one outfit for much longer than others. However, he owns many similar articles of clothing, only varying in color. He owns several blazers, crew neck t-shirts, and cardigan sweaters, usually in the colors white, black, tan, red, or various shades of green. He often wears mint-colored sneakers with white soles and shoelaces, and occasionally carries a tan satchel across his shoulder.
In the first day of the film -- the day he introduces Hiro to his friends -- he is wearing a white crew neck t-shirt with artwork of a ninja, along with a grey cardigan, brown pants rolled up around his ankles and his mint-colored sneakers.
On the day of his death at the San Fransokyo Tech Showcase, he wears an olive green blazer over a black shirt, with a similar pair of rolled-up brown jeans. At some point his hat falls of his head, as it is seen lying on the ground outside the building.
In MCF stories he makes his first appearance in a role the same as the movie appearing only as a childhood friend of both Tracy and Tricia. He also even appears to be having a childhood crush on Tricia with Tricia also having a mild crush.
- MCF: The Mystery of Tracy and Tricia(cameo)
- MCF: Big Hero 6 (Debut)
- He may be based off of Hiro's father in the comics, Tomeo Takachiho, who died, and Hiro built Baymax to fill his void.
- Before the film was released, Tadashi was rumored by many fans to be Yokai. In Return of Yokai he does become Yokai only for seeking revenge against Callaghan
- Although his death was accidental, the 2013 Rotoscopers video and early information regarding the plot somewhat implies that Tadashi was deliberately murdered in some early drafts of the script. The Rotoscopers video also depicted Tadashi as already attending classes with Hiro and was also the man in charge of a science research team (most likely consisting of Honey, GoGo, Wasabi, Fred) in which each individual would make different things and would eventually lead up to a competition.
- Tadashi's role is similar to Ben Parker, Peter Parker's uncle. Uncle Ben is murdered early on by a mugger, and Peter Parker becomes the superhero Spider-Man to find the killer, just as Hiro becomes a superhero to find who was responsible for Tadashi's death. Peter was also very attached to his uncle and looked up to him as a mentor, just as Hiro looked up to Tadashi.
- Although his specific age is unknown (usually debated as either 18 or 21), Tadashi is a legal adult. This can be assumed because when arrested, while Hiro is placed in his own cell because he is a minor, Tadashi is placed in a regular cell with other adults. No adolescent under the age of eighteen is allowed to share a cell with an adult due to the risks of child abuse.
- The artwork by Shiyoon Kim suggests that Tadashi wore glasses at some point.
- Tadashi was at one point a potential love intrest for Tricia until he died.