Having the character with the Fool arcana be the only one to do stuff like that would kinda ruin this a bit, since he's not the wild card and the RP shouldn't favor one over the other based on something like that. If social linking IS a thing, then I think that we should only be able to do it once we get a Persona, since that's when you begin to be able to do the social link with others in P3/4. That's just my opinion, though.