Au when both Tadashi and Hiro are different humanoid alien species found and adopted by Mama and Papa Hamada. Hiro has psychic abilities like telekinesis and Tadashi has fire and heat based abilities. However they were raised as humans so their abilities manifest much later.
Tadashi was old enough to know that he and Hiro weren’t quite human, but Hiro was so little he never really noticed that there was anything different between himself and the humans that took him in. Still the Hamada parents made sure to tell Tadashi over and over that they could not tell anyone about what they were or what they could do. And Tadashi listened
When their parents died and Aunt Cass took them in, Tadashi remembered his adoptive parents’ words, and told her nothing. Hiro had all but forgotten their extraterrestrial origins, so there was no risk of him saying anything, and their powers hadn’t kicked in yet, so Aunt Cass doesn’t know. Tadashi doesn’t even tell the rest of the SFIT crew.
The only other one who knows is Baymax, and that’s because Tadashi scans differently than a human. But Tadashi makes sure to program Baymax to keep his secrets right from the start, so the robot tells no one.
Tadashi’s powers manifest in the middle of the fire, allowing him to survive, but he doesn’t know what to do with himself after that. If he reveals that he’s alive, people will wonder why he’s unharmed, and those questions might dig up answers he’s been hiding since he was a child. But Hiro is so upset, and thanks to his secrecy programming, Baymax can’t even tell Hiro that he’s alive. All he can manage is “Tadashi is here”
But when Hiro starts manifesting his own powers during the fight with Callaghan at KreiTech, Tadashi knows he can’t stay hidden anymore. Hiro has no idea what’s happening to him, and the only person with the answers he needs is Tadashi. So Tadashi waits until they get home after the fight, and reveals himself.
Hiro does not take the news well. On the one hand, he’s furious Tadashi hid from them for so long. On the other hand, he’s already felt like a freak all his life, now he knows he really is one? And what will his new friends think of him?
Tadashi winces, because honestly he’s a bit worried about that too.
But to the brothers’ shock, their friends are honestly offended that they thought that they’d turn on the Hamadas just because they’re a little weird. I mean really, they hang out with Fred.
GoGo punches them on the shoulder, Honey Lemon tuts fretfully, Wasabi rolls his eyes, and Fred just complains that they kept such an awesome secret from him for so long. They don’t care one bit.
Meanwhile Baymax is standing nearby feeling very happy because his patients are all here together and safe and he doesn’t have to protect any more secrets
- Baymod