Brutus

Brutus (voiced by Kevin Michael Richardson) is a rat who is guard in The Secret of NIMH. He is first seen when Mrs. Brisby is at the entrance he greets her with his battle ax and she asks him if he's Nicodemus. But instead, he does not answer he's chases her back the way she came. Despite being scary and brutal, Brutus actually turned out to be a good guy. He is seen in the sequel.