Sticky is an 11-year-old boy with exceptional memory skills, having the ability to remember everything he reads or experiences. Formerly pressured by his parents to earn money in quiz shows, Sticky is timid and shy but eventually becomes a hero in *The Mysterious Benedict Society*.

Kate, a 12-year-old, is tall and broad-shouldered, with skills developed from growing up in a circus. She is fearless, resourceful, and skilled in physical activities, bringing her talents to the group in *The Mysterious Benedict Society*.

Constance is a two-year-old girl with a stubborn and sensitive mind. Living alone in a library before joining the group, her ability to make poems instantly helps conceal her uncertainty. She plays a vital role in *The Mysterious Benedict Society*.

Mr. Benedict is a kind, gentle genius who empathizes deeply with the children in *The Mysterious Benedict Society*. Despite his narcolepsy, he serves as a mentor and role model, promoting kindness and family values.

Mr. Curtain is the antagonist of *The Mysterious Benedict Society* and the twin brother of Mr. Benedict. He is a narcissistic and controlling genius with a malevolent agenda, posing a significant threat to the protagonists.

Milligan is a dedicated and fearless employee of Mr. Benedict, skilled in disguise and combat. He plays a crucial role in protecting the children in *The Mysterious Benedict Society*, despite his own loss of memory.