The whole thing was really fun, giving us insight into a character we knew little about aside from the fact he was Anais' teacher in a previous episode. Mr. Corneille seemed to have a lot in common with the school counselor, being so pacifistic and peace-loving, but every time a character with a completely different style of depiction (like Corneille's 16-bit pixellation) shows up, it adds even more fun to an already fantastic show.
My only complaint is about the description: Joao Dega is a very Brazilian/Portuguese name. It's possible a Brazilian Portuguese man-fist-thing could be from Russia, but then why give him such an obviously Brazilian name?
I know it's a silly minor complaint, but I'm 'one of those people'.