~Can she drink blood from your character? If she can manage to get it from Yuuki.
~Can she transform into your character after drinking their blood? SURE. That would be kind of interesting... except to her CR.
~Can Diva give your character her blood? Yep. Although Yuuki wouldn't take it if ever offered instead of forced. It probably wouldn't do anything to her, though?
~Is there anything that you want me to avoid talking about? Nope!