Rollo is a character in Valiant. He's a member of the French Resistance: Mouse Devision and he's an expert of sabotage, he likes it so much he likes to make sabotage (even when he hears the word). Which shows he may well be a bit crazy. He helped Charles De Girl guide Valiant and the Royal Homing Piegeon Service through the battle field to get the message.
He was voiced by Buckley Collum.