Benny is a large rat, which can do human things.
Benny is a rat found in the history level very rarely, which guides you through the level.
Benny can cook, do math, read, and uhhhhh he can stun teachers for 10 seconds, but with a 5 minute cooldown.
He is found in a random room, every 10 times the history level is loaded. You must press "E" repeatedly in a hole, pulling out multiple garbage items. Eventually you will pull out a rat which is named "Benny". Right click and it will follow you, acting like albert and telling you the answers. It can be stored in the belt, but all it will do is summon the mouse house. He appears as a grey, large mouse with no whiskers and a square head.