I would advise watching the earlier episodes for this role. The original Chatot talks in these and we're looking for someone who can give a similar performance.

Chatot is the organizer and lone faculty of the Wigglytuff Guild. He always has a lot on his plate, which causes him to lose his temper when a lot of things get piled on him. He's a little afraid to be belittled, so he tries to keep an authoritarian presence.

Also, Chatot is obviously a bird, so you'd need to give squawks and bird-like laughs.