The demon that can manipulate blood and heal himself is likely referring to the character "Rui" from the manga and anime series "Demon Slayer: Kimetsu no Yaiba." Rui is a member of the Twelve Kizuki, a group of powerful demons serving under the main antagonist, Muzan Kibutsuji. Rui has the ability to control and manipulate his own blood, using it as a weapon in battle, and he can also regenerate and heal himself using his blood manipulation powers.
