You don't know everything he can do. He starts off as seeming like just an ordinary vampire gunmen, and we learn he can at least regenerate.
Then we learn he can summon a hound demon.
Then we learn he likes to impale.
Next you'll learn what Control Art Restriction Zero means.
Then you learn about who he used to be for the past 5 centuries.
There's a lot to know about him, he's not that shallow a character.
And Seras is cool too.
I never liked the major, he's cliche as fuck.