Thea Stilton isn’t much of an office mouse, she prefers hanging from tree branches and climb building ledges to get the perfect shot. Thea is strong and confident. She has a black-belt in Karate and she can pilot or drive anything that’s been built, but she’s also vulnerable and has a wry sense of humor. There’s a sensitive side to Thea for Benjamin Stilton, whom she loves dearly and would do anything for. She is somewhat of a tomboy. She calls her brother Geronimo "Fraidy-Mouse".