Maria is the supervising teacher of the Neighbors Club; she is a ten-year old nun. While a child genius, she is also very rude and immature, and often uses a variety of expletives when annoyed. She develops a sibling-like relationship with Kodaka, who regularly makes her packed lunches, and is affectionate with him, much to Kobato's annoyance. She is also gullible, which Yozora uses to her advantage, and at some point, Kobato uses it to win an argument.