Runescratch has an AU where Tadashi's dad made a robot infused with microbots. Tadashi somehow gets possession of the robot (inheritance?) and finds out that it's an AI and names him Hiro, or maybe already knew he was an AI named Hiro not much detail there. Hiro sometimes uses the microbots for some not so good things (whether stupid ideas or illegal stuff) and also wants to be human but obvs isn't.
Tadashi had known Hiro from a young age, watching his father work on the robot with wide eyes filled with wonder, and then later interacting with the robot to help his father refine Hiro’s AI. He’d absolutely adored the robot, thinking of Hiro as a brother as they spent time together and played (his father considered it an exercise in establishing exactly what Hiro’s microbots could do. Tadashi just thought it was awesome that Hiro could turn his arms into monkey bars for Tadashi to swing off of.
But then one day Hiro’s AI had a malfunction, and he ended up accidentally hurting Tadashi while he spazzed out. After that Tadashi’s dad decided that it was too dangerous to have Tadashi around the robot anymore, and Tadashi didn’t see Hiro again.
Until after his father died.
A few months after the funeral, Tadashi finally got around to cleaning out his father’s old lab space. When digging through the piles of papers and boxes of tools and invention after invention, Tadashi happened to stumble upon Hiro, deactivated and lying on a table covered with a sheet. Curious, and honestly feeling a bit lonely and like he just needs someone to talk to now that his parents are gone, Tadashi decides to reactivate the robot, even though his last memories of Hiro involved pain and fear.
But when Hiro boots up again, his eyes lighting up and his body coming to life right before Tadashi’s eyes, it’s like no time has passed at all. He immediately grins up at Tadashi and asks if he’s ready to play again, as if he doesn’t even notice that Tadashi is years older now. And it completely catches Tadashi off guard, but he’s already raw from having just lost his parents, and now being slapped in the face with this memory of happier times, Tadashi just starts crying. He ends up on the floor, clutching at himself because it all just hit him at once, and he misses his parents so badly and he’s so alone and he just wants his family back.
Hiro just watches, unable to react because he wasn’t programmed to have empathy. But if Tadashi had been able to look at him, he might have seen something like concern in the robot’s human-like eyes.
- Baymod








