Unbelievable. What would Mom and Dad say?

Tadashi Hamada is the tritagonist 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: a robotic, personal healthcare companion.

An accident caused by a mysterious fire catalyzes the events of the film, leading Hiro, Baymax and Tadashi's best friends to band together to investigate the "accident" and catch the culprit responsible.


Tadashi Hamada was an inventor and the older brother of Hiro Hamada. The Hamada boys were taken in by their aunt Cass some time after the death of their parents, where they were raised in her café in the city of San Fransokyo. While Hiro was unable to remember their parents due to his young age, Tadashi possessed a clear memory of what they were like. During their childhood, Hiro exhibited high intellect for his young age, although Tadashi was the only person to fully understand how he felt due to the boy's intelligence isolating him from friends. They also came up with a special set of rules that only they knew.[2] By the time Hiro graduated from high school at the age of 13, Tadashi was accepted into the prestigious San Fransokyo Institute of Technology, where he became friends with Go Go Tomago, Wasabi, Honey Lemon, and Fred. However, Hiro soon became involved with bot fighting, to the displeasure of Tadashi who believed that Hiro was wasting his potential when he could do something useful with his gift.

During his time in the SFIT, he earned his very own laboratory through hard work, and later started a project about a healthcare companion robot that would help people. The conception for this idea began when Tadashi became a fan of Dr. Trevor Trengrove and read his groundbreaking thesis about artificial intelligence (though time later, the work was revealed to be stolen and not Trengrove's idea). Tadashi owned a copy of the thesis, and the robot was named "Baymax". After many failures and a large number of recorded trials (exactly 84), Baymax came to be, and became Tadashi's best invention. He introduced the robot to Aunt Cass and his friends at some point. Along with Baymax, Tadashi invented a healthcare chip with a large database of nursing information, and allowed Baymax to hold most kinds of information including memories.

He participated in a seismic project for the SFIT where he created a model of a building that would support huge earthquakes, and Baymax learned about this as he later told Hiro about it when the boy inadvertently duplicated the project.

Due to Hiro's initial problematic behavior, Tadashi also had sewn mini-GPS systems into every one of Hiro's hoodies to keep track of him.[3]

Regardless, Tadashi had a great bond with Hiro and took him to many haunted houses in Halloween days.


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.

Tadashi is very hard-working and 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 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 that 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 that 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 can still be rough on occasion. He is also not above scolding Hiro or becoming upset with him, getting 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. He encourages Hiro to be the best that he can be and supports him in his endeavors. He was also sneaky, as he promised Hiro he would take him to a bot fight but in reality took him to his university, claiming he "needed to get something" before they headed off in order to get Hiro to come to his university and become interested in it while technically keeping his promise of "taking him to the bot fight" without actually doing it.

However, he was also shown to have a silly, goofy side to himself. When he introduced Baymax to Hiro and Baymax asked if he is experiencing any pain, Hiro asked "physical or emotional", causing Tadashi to comically pout. When Hiro ran out of ideas, he grabbed Hiro and shook him upside down in order to shake some ideas into his head and stated that Hiro needed to "look at things from a different angle"--a philosophy that Hiro eventually adopts as his own during the film. He was also excitable, as shown when he was happy after finally activating Baymax (after 84 tests) and ran around and kissed Baymax.

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 a tall, slender, slightly muscular teenager of a larger build than others in his family. He has large, warm brown eyes and neat black hair cut above his prominent ears. His face shape is different from those of his aunt's and brother's, 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 is rarely seen without this cap in the film, except for a few scenes such as when he takes off his moped helmet, and it is also off in many family photos that can be seen.

Tadashi's main choice of apparel is based off of a smart-casual type of fashion, which is usually neat, conventional, yet relatively informal in style. His choice of outfit and color coding reflect his personality, smart yet vibrant and full of energy. Since he 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.

When 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. He wears the same shirt to bed that night, with green plaid pajama pants.

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. Before he runs into the burning building, his hat falls off of his head, which Hiro retrieves and keeps as a memento.


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 for his actions, only to find themselves caught and arrested by the San Fransokyo police. Yama and his gang are forced to share a cramped cell with Tadashi, while Hiro has a separate cell to himself due to being a minor. Tadashi was not happy with this and silently glared at Hiro across from his cell for getting them into the situation. Fortunately, they are released on account of Aunt Cass, who scolds the two on the ride home.

Frustrated with Hiro's bot-fighting obsession, Tadashi takes his younger sibling to his school, the San Fransokyo Institute of Technology, in hopes of sending him down a better path. At the Institute, Hiro meets Tadashi's closest friends (Go Go Tomago, Wasabi, Honey Lemon and Fred). Tadashi then takes Hiro to his lab and shows him his latest invetion, the robot Baymax, and before leaving, they meet Professor Callaghan—an aspiring master of robotics and Hiro's personal idol. The experience successfully manipulates Hiro into having a strong desire to attend the school. To gain acceptance into San Fransokyo Tech, Tadashi suggests that 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 that he look 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 and Hiro have some time alone, during which the older brother congratulates the younger one on his accomplishment, showing pride in the new path that he's willing to take. Just then, a fire breaks loose at the school and the brothers immediately rush to the action. While most civilians manage to escape, Tadashi learns from a survivor that 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 while a heartbroken Hiro falls into a deep state of depression. Hiro, with the help of Baymax, eventually finds clues about a mystery man who might have been involved in Tadashi's "accidental" death, and forms a superhero team along with Tadashi's friends to avenge him. The quest leads them to find out that the fire at the SFIT was not accidental, but rather, an attempt by none other than Professor Callaghan to fake his own death and get revenge against Alistair Krei anonymously over an accident that involved Callaghan's daughter.

Callaghan was well aware about Tadashi's death, but coldly told Hiro that his death was his own fault for going inside to save him. Consumed by anger and frustration over this statement, thinking Tadashi's death was in vain, Hiro tried to force Baymax into killing Callaghan, but the man escaped and Baymax was reverted to his caring-self thanks to Hiro's friends.

Hiro took Baymax away to try and put the violent chip inside him again, but the robot instead showed him a series of footage which was recorded while Tadashi was in the process of building the healthcare companion to comfort the boy. In it, it is 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 hard-earned 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 heal Hiro's damaged heart, and as such, the young prodigy vowed to use his intellect for the better, which he does by defeating Callaghan and getting him arrested, rather than attempting to take his life again.

Tadashi then becomes a key character in "Baymax Returns"; after Callaghan's arrest and Baymax's demise when the robot saved Callaghan's daughter (who turned out to be trapped inside a mysterious wormhole), the recently formed superhero team disbands and Hiro is finally ready to attend the San Fransokyo Institute of Technology. Before his first day in class, Hiro watches a video on his phone about himself riding a bike, helped by Tadashi to do it all alone. Hiro pauses the video and looks at Tadashi woefully, then sets off to the Institute.

He is taken on a tour by his new friends, but the first thing he does is go inside Tadashi's former lab and wishes he was still there. He finds a notebook that contained Baymax's blueprints, and the hand of Baymax's armor, which was the last remaining thing from the robot. The hand though, contained Tadashi's healthcare chip and Hiro eagerly realized he could buy a new body for the robot, since the chip would still contain its memories. Hiro is interrupted by Professor Granville, who tells the boy that he must earn the lab before working on it, like Tadashi once did.

Yama also returns with a robot army of his own, so Hiro and his super-friends reunite once more to stop him, and after foiling his plan they officially become the superhero team known as Big Hero 6, deciding to help people in honor of Tadashi as it was his dream to do so.

During the film's credits, a newspaper reads about a ceremony of a building dedicated in Tadashi's name taking place, in which Hiro accepts the honor on behalf of his late brother. Krei Tech Industries builds the hall in the SFIT.

In "Failure Mode", Hiro feels like finally giving up after failing many times for his school project, but Baymax shows him the 58th test recording of his creation, where Tadashi himself also felt tired of so many failed attempts yet kept going nonetheless; Hiro never saw his brother like that, and the video motivated him to continue with his work.

In "Small Hiro One", Hiro gets Tadashi's copy of Dr. Trengrove's thesis, and gets it signed but Trengrove incorrectly signs it "To Kiro". Hiro also mentions that said thesis was the inspiration for Baymax's creation and that Tadashi admired Trengrove greatly.


Hiro HamadaEdit

Hiro is Tadashi's younger brother and likely the most important person in Tadashi's life. He and Hiro had also become best friends, considering their duo as an 'exclusive club', according the Hiro and Tadashi book. They liked to keep secrets and make up rules that only the two can know. They shared a bedroom presumably since they first moved in with Aunt Cass 10 years prior to the events of the film, allowing Tadashi to always be there when Hiro needed him, academically or emotionally. Because they were raised together, no one knew Hiro's emotions and issues better than Tadashi and vice versa. Tadashi was also the one who encouraged Hiro to become interested in robotics and they are seen assembling a robot toy together in a family photo as children. Hiro's health, happiness and well-being were of utmost importance to Tadashi and he was disappointed when Hiro continued to bot-fight underground instead of trying to do something productive with his incredible intelligence. He not-so-subtly persuaded Hiro to apply at San Fransokyo Tech and pursue a career in robotics alongside him and is tremendously proud when Hiro succeeds.

Aunt CassEdit

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

Go Go, Wasabi, Fred and Honey LemonEdit

Wasabi, Go Go, Honey Lemon and Fred were Tadashi's classmates and closest friends. They were shown to have a close bond and were regularly seen with one another outside of school. After Tadashi's death, the remaining group members took it upon themselves to watch over Hiro and eventually welcome him into their circle of friends. Not only that, but they also carried out Tadashi's hopes and dreams of helping the world by remaining members of the Big Hero 6 superhero team.


Tadashi is the creator of Baymax. Before completing him, Tadashi suffered from Baymax's unintentionally erratic and violent behavior, such as quickly jabbing into Tadashi's head with his fingers, shorting electrically (creating a burn hazard) or hurting his ears with high-pitched noises. As soon as Baymax functioned properly, however, Tadashi was ecstatic, humorously running around the room excitedly before asking the robot to scan him. Tadashi was incredibly hopeful at the existence of Baymax, hoping that someday, the healthcare companion could help the sick and injured all over the world.

After Tadashi's death, Baymax takes his place as Hiro's emotional support, something that Hiro doesn't initially want, nor does Baymax understand. Attempting to make sense of Tadashi's absence is also one of the first times that Baymax deviates from his normal functionality. At one point, he calls Tadashi's name while looking at Tadashi's belongings, wondering where he is and when he will come back, something unusual for him at this point. He did not understand that Tadashi could be dead, as he had previously scanned him and calculated that Tadashi was in excellent health at the time.

Professor CallaghanEdit

Professor Callaghan was Tadashi's professor and mentor at the San Fransokyo Institute of Technology. The two shared a unique relationship amongst the institute's crowd, as they showed a high level of mutual respect, bordering the lines of a father/son relationship. On Tadashi's side, the young prodigy admired Callaghan greatly for his aspiring ways and innovations in the world of science and technology. Like his mentor, Tadashi was shown to be an inspiring and wise innovator, especially towards Hiro and his friends. Judging by their interactions and similar outlooks on science and intellect, it can be implied that Tadashi learned such traits from Callaghan.

The strength of Tadashi's admiration for Callaghan was truly established moments before the former's death, as the young man was tragically killed trying to save his mentor from a huge and deadly fire. Unfortunately, the sacrifice was ultimately for nothing, as Callaghan was the one responsible for starting the fire, which he did in order to cover the tracks of his crime of stealing Hiro's microbots. When told Tadashi died on his account, Callaghan showed no remorse for causing the tragedy, callously dismissing Tadashi's death as his own mistake. With this, while Tadashi obviously admired Callaghan, it is unknown whether or not Callaghan truly cared about Tadashi. However, the very least that can be said is that Callaghan did not intend to outright kill Tadashi when he started the fire to cover his theft of the microbots.

According to the junior novelization, Callaghan was also the last person Tadashi saw before meeting his demise.


  • Tadashi - Tadashi is a Japanese masculine name. It has many meanings, but is known for meaning "righteous", "correct" or "true". Simply put, the name describes a good, honest person, fitting as Tadashi is loyal to his friends and family, and true to himself and to others. His name written in kanji is 浜田義 (Hamada Yoshi); the kanji 義 also means "morality", "duty", or "honor".


  • Tadashi may be based on Hiro's father in the comics, Tomeo Takachiho, whose death prompted Hiro to build Baymax to fill the void left in his heart.
  • Although his death was accidental, the 2013 Rotoscopers video and early information regarding the plot somewhat implies that Tadashi was deliberately murdered by Yokai 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, Go Go, Wasabi and Fred) in which each individual would make different things and would eventually lead up to a competition.[4][5]
  • During an interview with Tadashi's voice actor, he said that Tadashi would be around 19 or 20 years old.[6]
    • According to Japanese media, Tadashi is 21 years old.[7]
    • This information is contradicted by official Disney publications, which state that he is 18.[8]
    • In the scene where Tadashi and his brother Hiro, are caught at the bot fights by the police, it can be implied that Tadashi is at least 18 years old because he's in the same cell as the other bot fighters. If he was a minor, like Hiro (also shown because Hiro had his own cell), he would have his own cell also.
  • Artwork by the film's character designer Shiyoon Kim suggests that Tadashi wore glasses at some point. In older concept art, he was also much older in appearance.
  • The colors of the logo in Tadashi's hat invert between the film and the illustrated books. In "Hiro and Tadashi", the N is red while the S and F are gold, but it is vice versa in the film.
  • In Avengers: Age of Ultron, when Tony Stark is getting the A.I. Card for F.R.I.D.A.Y., there is another card with "T.A.D.A.S.H.I." written on it.
  • In the Korean dub of the film he is renamed Teddy to avoid offending Korean audiences.
  • In the Japanese dub of the film, Hiro frequently refers to Tadashi as "nii-san", which means older brother in Japanese. His name is also pronounced "tada-shi" rather than "ta-DA-shi".


Big-hero-6-gallery clear render words An Image Gallery is available for
Tadashi Hamada.


  2. Big Hero 6: Hiro and Tadashi
  3. Big Hero 6: The Essential Guide
  8. Big Hero 6 (Disney Book of Secrets): Hiro’s San Fransokyo Files