For now on, I'll call that lady Forepaw Woman. Also, that guy in the jacuzzi has s t a r s on his hair. He probably got inspired from Diavolo's black pepper hair.
@AltAidey I understand what you mean, but what I said is true since some people believe it could be the head doctor or even Tsurugi. Maybe in the next chapters we'll be able to confirm it, but for now I've basically narrowed it down to 3 characters.
Unless Araki does something unexpected.
It's been 85 chapters and we still don't know who the main antagonist is. It's interesting because in all the other parts you already know who the antagonist is even if his, specifically Diavolo's, face hasn't been revealed yet.