Hellsing, Vampire Hunter D Recommendations
Both are anime feature powerful vampires (D is technically a Dunpeal), that hunt other vampires and other supernatural nasties! The sequel "Bloodlust" is great as well!
Both series involve vampires, yet more importantly both series are classics done in older styles which some may pass up because of this. Vampires are scary in both, yet the protagonist who is an anti-hero ends up a major draw.
BLOODSUCKERS! and they do their job well in the human world , both simmilair in the clothing style, wide top hat, long capelike jackets, handgloves, dressed mostly in 1 color, put their service to humans and have terrifying skills!
vampire anime featuring a dude with a hat as the MC
the main female protagonist is a young blondie who bonds with the MC