Does your character have blood?: Yes
Would their blood smell better or worse based on that Affinity: Well, he's middle age by now, and he's pretty listless in a cat sort of way. The more of Gon he'll get the more tiresome he'll find things to be; though that's mainly because of laziness or early onset of old-man-blues even though he's not old by kitsune standards.
Any other notable facts about their blood: He smokes pretty much. Not as much as Gon and normal cigarettes instead of whatever it is in Gon's magical pipe. I'll get back to you on the inhuman thing once he stops being human. He is otherwise very healthy and he likes food a lot.
These days he's more furry. He's still technically human, but I don't know if the added fur is going to change what his blood taste like.