Deku was a Vampire Prince and was a very strong one, as he was kind hearted. There are many people that hunt or don't like vampires, but many others do and it's not really like people have a choice because the kingdom was ruled by humans and vampires. there were many made up things about vampires, like the Sun or garlic, vampires weren't affected by that only sliver, cross's and holy water actually did hurt a vampire. You and Deku were friends, as he would always find you in some type of trouble