He really wants Charr. Huge test, a guy who has barely fought in half a decade and had both hips replaced. Not to mention he is old.
Hopefully Joyce because that would be an easy fight to make for Big Frank If for whatever reason it's not Usyk or Joyce, I'd like to see Fury give Bakole a shot. #7 ranked by WBC, a solid contender who would give Fury a good fight.
Probably Charr or Price since he's recently tossed those names around, and if he does beat Usyk I could see him making those fights as title defenses. I think Price is retired but I'm sure he'd be willing to come out of it for the payday. Depending on why the fight doesn't happen, like if it's made but Usyk gets injured and it has to be postponed, I could also see him maybe fighting one of those exhibitions he mentioned when he was saying he was retired, just as a time killer fight. I'd like to see him fight Joyce or AJ, but eh, I doubt it would happen. AJ wants a bounce back fight and Joyce seems to be tied up at the moment. I'm hoping Ruiz beats Wilder in their upcoming fight so he can be a potential opponent, and because I think Fury and Wilder have fought more than enough. Personal choice would be Zhang. I give him very little chance of beating Fury, but I'd like to see him get in the ring with some bigger names, even if it's ones I don't see him beating. I just have a soft spot for Zhang, no idea why.
Fury would probably fight Joyce. And easily outbox him, if he can still move and it's just been the extra fat slowing him down. If he lost significant speed/movement it could be more interesting but Fury still has far faster hands and better defence.