I think a lot of people are misunderstanding the whole “ugly vampire” dialogue between Mika and Lacus
In the manga Mika specifically uses the term “ugly bloodsucker”. If you don’t keep up with the manga this term was coined by Yuu when they were both children in the vampire city.
Yeah, Mika is calling himself ugly because he’s a vampire, but that’s not the entire weight of the quote. He’s playing on Yuu’s words almost like an inside joke.
Mika thinks of Yuu a lot and it’s honestly heartbreaking