"Canon" is probably Oboro/Takumi and Flora/Joker (that one is onesided, for sure), but I think we've already said that, so idk.
Personally, I found Jakob/Felicia's supports hella bad, despite the fact I'm pairing them up. He insults her C-A, and then suddenly cries and asks her to marry her in S iirc. But that seems to be most Jakob supports?
Orochi and Hinata's S support is strange, too. Pairing them up at some point because the S support is funny, but it's also just...weird.