
Karin has an entire family of Friendly Neighborhood Vampires, the most obvious example of which is the title character ◊. McDowell on Negima! Magister Negi Magi (She would argue with you.) The heroine and her servant match the trope perfectly, or would if they weren't even further from traditional vampires than the Schiff. They're still nice people and ultimately Heel≯ace Turn. Blood+ has the Schiff, who aren't technically vampires but have vampire problems (sunlight is lethal, need to regularly drink blood). Master of Mosquiton: In both his television and OVA depictions, the eponymous vampire is a Dogged Nice Guy who's at Inohue's beck and call. There's a reason Alucard has hundreds of thousands of dead souls at his disposal. Just don't get on his bad side or insult Integra.
He certainly has more moral standards than and openly opposes Millennium's vampires, anyway.
Her Master, Alucard, functions as a Friendly Neighborhood Vampire, but only because Integra's got him on a leash. Additionally, in the anime series, she assumes the Vampire Detective role on several occasions. She retains her perky and somewhat subservient disposition, despite impressive battle-lust. As a Reluctant Monster, she refuses to drink blood when she finally gives in and sucks her crush's blood in response to his dying wish, she is recognized by the other characters as being a true monster. Given the large number of antiheroes on this show, this is quite impressive.
Seras Victoria starts out as and stays a good girl.