Paige EM. In " The Bot-Fighter ", Hiro's old ambitions would return when several heists involving battle bots were happening in San Fransokyo and some of Hiro's former bot-fighter friends were being framed for the crimes. When Hiro went to an abandoned Krei lab to track down Yokai, he initially grew to believe Krei was Yokai but was proven wrong after taking Yokai's mask and learning it was Callaghan. Baymax talks to Hiro about the situation of killing Callaghan, asking if his death would appease the boy. Over time, Big Hero 6 garners a large following throughout San Fransokyo. Impressed by his intellect, he wanted Hiro to join his side and make him his student once his plan to rebuild San Fransokyo was complete. The emotional core of Big Hero 6 is driven by four key characters, their arcs, and the relationships they share with one another, being Hiro, Tadashi, Baymax, and Callaghan. Within the grasp of the fist, however, Hiro discovers Baymax's original programming chip which contains both his personality and memories.
As such, Baymax is given a few upgrades, including a super-suit equipped with martial arts battle programming and a new chip which gives him such abilities. Baymax is the last to be upgraded and after his new super-suit is revealed, he and Hiro take a test flight for the first time throughout the city, eventually landing on one of the air balloons towering over the city and overlooking a sunset. Hiro appears in the third installment of the series. Once again, their relationship appears to ascend in " Fan Friction ", where Karmi is kidnapped by Momakase, and he comes to her rescue in his superhero form. Later, he helped clear the tracks so Connor could deliver the last of his passengers on Christmas Eve and nearly mistook Harold for Santa Claus. According to Tadashi, the school holds an annual convention where up-and-coming geniuses are meant to showcase new creations. Sparkles becomes jealous of Mochi and threatens to hurt the cat, so Hiro creates a robot named Skymax to save him, and Yama also comes back with a new robot called Mega Yama. Two examples of this class are preserved in working order in Japan. He was the strongest engine on his railway and was famously known as the "Master of the Railway". Because of another faulty signal not being able to warn anyone that he was stuck on the track, Henry ran into the back of Hiro's train and derailed, dangling dangerously over the edge of the viaduct.
In late December, , Hiro made a special appearance in Disneyland Paris, debuting as an atmosphere character in both his civilian wear and superhero armor. There, they ponder on the true identity of Yokai and how to find him. Although both of them are sharing the spotlight as SFIT's youngest student with her held little importance to him, he often tried to get on Karmi's good side in a few episodes, but eventually played along with the civilian rivalry with little care. They later decide to join forces in order to save their world from the invasion after formally introducing Sora, Donald, and Goofy to the rest of the Big Hero 6 team following Hiro discovering a news article online that proves discouraging to the team upon reading it. Hiro tells the professor that he's got nothing, but will have something to propose by the deadline. Before they set out, the team shows Hiro a recording they found, which reveals that Abigail was the daughter of Callaghan and the entire goal behind his villainy is to extract revenge on Alistair Krei. Their relationship started out basic. However, he made up for his mistakes by telling the engines to go to Knapford and await orders from the Fat Controller.
Hiro then enters the lab and looks at Tadashi's stuff, where the young genius saw Tadashi's cap and Baymax's last piece of armor: his rocket fist, reminiscing of their time together fondly as he comes across it. A heartbroken Hiro tearfully explains that Tadashi died trying to save the professor, but Callaghan coldly responds by blaming Tadashi for his own death. Though the Jacks are defeated, Obake succeeds in his scheme as he makes Krei does install his chip and hacks into his system. The magnetic pads can also be used to deflect or attract metallic objects. When the Fat Controller found out about the situation, Hiro was brought to the Sodor Steamworks , where Victor oversaw his restoration. For the Marvel Comics character he was inspired by, see Hiro Takachiho. Thanks to all customers and visitors! After defeating the villains, Richardson Mole is electrocuted and causes memory loss on him, thus he stops being a menace to Big Hero 6 as he forgets their identities. Baymax talks to Hiro about the situation of killing Callaghan, asking if his death would appease the boy.