What if... Tadashi and Shiro actually met? any HCs?
> They’ll become totally understanding about (and probably even become close with) each other cuz they can really relate in a lot of things considering they have so much in common.
> They’d totally talk about their little brothers (Hiro and Keith) a lot. Either tackle how stubborn, troublesome, or simply great they are the way they do things on their own and such.
> THE INSPIRATIONAL WISE DUO
> I headcanon they both need to improve their culinary skills lol Given that Shiro canonically is not that good at cooking, I always headcanon Tadashi is just not as good either.
> Tadashi (and Hiro) going all nerdy cray cray over that reeeally cool galra prosthetic arm of Shiro’s cuz seriously, he (they) probably would.
> Big Brother Teamwork. I can imagine them have this system that when one of them can’t watch over their little brother because of errands, they entrust them to each other to keep an eye on them while the other one’s busy. Shiro or Tadashi watching for Keith and Hiro from time to time.
> Tadashi knowing about Shiro’s PTSD so he introduces him to Baymax in order for the nursebot to tend to Shiro in whatever way he can help him when necessarily needed.
> Hamada bros and Broganes bonding moments!!! like playing video games, late night movie marathons, and talking science together!!
> Shiro’s part of the high rank commanders in the Garrison, that being said, he probably knows a lot of things about space-related or science-related knowledge in general. So imagine he shares those information to robotics science nerd college student Tadashi who’s very pumped up to be enlighten by those amazing experience from Takashi. Especially when Shiro tells him that “Aliens are real!”
> Okay but, Shiro also becoming a father figure to Tadashi and like everyone else in team voltron, look up to him.