Leandro Valhalla

Leandro Valhalla also known as Leo or F5 is a minor character from the first "Secret of Nimh" film, and the main antagonist from its trilogy "The Secret of NIMH 3: R.T. & Margaret". He is the younger son of Mrs. Brisby and the late Jonathan Brisby. Leo is missed son of the Brisby family who was bitten by a spider and was carried to NIMH in the beginning of the film.(He is nit an original character in the books and he was supposed to be the villain). He was first shown hidden under the dam. Leandro trembling with fear, and Racso asks if it is okay. because he thought it was Timothy