Does your character have blood?: Yes!
Would their blood smell better or worse based on that Affinity: While I'm definitely saying worse here- especially recently yay character development, Silver is feeling bright and youthful and ready to take on the world- I totally want a running gag where Elda absolutely knows when Silver just got out of a bad day at retail because damn his blood smells fine, that's weird.
Any other notable facts about their blood: Idk his blood's probably fine (Kingdra probably smells best out of the Pokémon but you don't want to bite that)