Moka Akashiya is a central character in the anime series Rosario + Vampire. She is a vampire with a split personality, where her outer persona is sweet and kind, while her inner self is more powerful and assertive. Moka becomes a close friend and protector of the protagonist, Tsukune Aono, after he unknowingly enrolls in a school for monsters. Her character is crucial in the storyline, as she often saves Tsukune from danger and helps him navigate the complexities of the monster world. Moka's turbulent dual nature adds depth and intrigue to the series.