Here's what I bought from trexking45 on DA, this is Mad Mat and here's his backstory.

Backstory: Mat started out as a stand-up comedian as he is telling some jokes that his audience all laughed at, until December of 1997 while he was doing his stand up, the voices inside his mind interrupted him before he could ever finish his joke. It kind of made him mess up his joke, going from funny and comedic to being more serious and offensive, everyone thought he was being heartless and had tolled a lye about his joke. So they threw rotten tomatoes at him and as he try's to explain to the audience that everything he was saying wasn't at him but with the voices in his head, he slipped on a rotten tomato and fell on his head as it cause him to lose some of his memory. Then as the police took him to the prison and putting a straightjacket on him, he ended up going crazy and decided to escape by kicking a whole in the wall. Now the a master criminal and has an army of dummies that are controlled by robots, his layer is full of prank filled booby-traps and he has a tank full of laugh gas that he'll use to spread his own laughter to the whole world as he is now known as Mad Mat and need his memory back.

Note:
Mad Mat is created by trexking45 on DA
and Sly Cooper is owned by PlayStation