Mrs. Frisby
Mrs. Frisby is a widowed mouse with four kids named Timothy, Cynthia, Teresa, and Martin. She is also the most important character in the book. She is also called Mrs. Brisby. Without her, Timothy, Teresa, Cynthia, and Martin would have never been born, the rats would have been killed, they wouldn't of had to dig up and move Mrs. Frisby's house. Even the title would be changed to And The Rats of NIMH.