Does your character have blood?: yup! type B positive!

Would their blood smell better or worse based on that Affinity: This is actually touched on in canon by Slayer, but ki users with high proficiency (May included) have SUPER rich blood. That and May's cheery personality may mean her blood is too "sweet" for Elda.

Any other notable facts about their blood: As said, May's incredibly high proficiency with ki usage (it's how her super strength works) richens her blood. So if anything it'd be like an exceptionally indulgent dessert than anything else.