I think the only ones I really disagree with here is that I could see Junkrat being more pan on account of he just wouldn't really give a fuck about who's opposite him
bastion doesnt have enough life experience or any concept of relationships with humans that doesnt involve them being terrified of him so he's a giant question mark imo
I can see Winston having a healthy romantic relationship with superintelligent robots/people, but it is strictly about an intellectual equal and witty science banter.
I mean you have characters like Pharah and Tracer who you know would be grumpy children in the medbay and how can you not be endeared to how they'd pout
And Winston retorts with a series of relentlessly logical and compassionate arguments about teaching Bastion about humans and making a bridge of trust until finally Mercy throws up her hands in surrender
she makes them figure out a way to rig up his minigun so that it can be removed because darnit, she can understand that reasoning but STILL NO WEAPONS IN THE MEDBAY >:C
And then suddenly Mercy realizes that she is freaking out because dammit it might be an incompetent robot sidekick but its HER incompetent robot sidekick
also it probably gets real awkward in medbay for a while because naturally everyone in overwatch has a kneejerk reaction to seeing a bastion model puttering around
Zarya: "Sleeper hold"
Mercy: Zzzzzzz...
Dva: Crushing on Hanzo
Hanzo: Gay and oblivious to it all
Pretty much