While he's really a very serious and scholarly scientist, the Beast has taken the role of the joker to heart. He's always cracking jokes and making fun of his opponents, or launching deadly puns. He also greatly enjoys showing off his extensive vocabulary in pretentious and intricate sentences. He also greatly enjoys showing off his extensive vocabulary in pretentious and intricate sentences. He has developed a wide range of unusual expressions, some of those being French or Latin. Cramming as many polysyllabic, literary and scientific terms in a sentence as possible and still making sense is a sort of sport to him. 

base your performance of Beast of his appearance in Marvel Ultimate Alliance 3. Here's a reference video.

 https://www.youtube.com/watch?v=gy--rVgVOcw