Mana-chan was a pure, innocent girl who diligently took care of Miss Monochrome in their castle after Miss Monochrome took her in. However, she later ran off with 19.3 billion of Miss Monochrome's money and became the manager of the idol Miss Monochrome admired, Kikuko.
The main character in the story. An overall nice guy attending middle (and later high) school who gets caught up in many embarrassing but endearing romantic situations. Although his thoughts on girls can get quite perverted on occasion, his gentleness and kindness, as well as his selflessness at times, is what attracts girls to him. His dream is to make films as a director. While not academically gifted, he has great talent with cinematography that gradually develops as the story progresses.
Anju is Karin's younger sister and she absolutely loves her, close to the point of obsession. She will do anything for Karin. She has not quite awakened as a vampire, causing her to be somewhat sensitive to the sun, and resulting in her only attending school on overcast days. However, she does have an amazing control over bats despite this. Anju is very reserved, speaking in a quiet manner and wears a Gothic Lolita attire. Boogie-kun is her companion, whom she carries around and is her favorite of her dolls, something she enjoys collecting. In the anime, Anju's blood preference is jealousy when she awakens. In the manga, it's loneliness.