You would protect Deku and teach him things, he was very interested to know what things looked like outside the castle. You were always wondering why Deku would try and sneak outside, even in the dark, just to explore, kinda like an adventurer, but he's still a prince. You are a vampire, which is something that's usually peaceful in the kingdom, some are known to hunt vampires and some towns don't mind them. You were a very mysterious person. Deku's blood was pretty valuable, for being royalty.