From the Super Mario Wiki
Boddle's assistant is a Beanish character that assists Boddle with the Yoshi Theater in Mario & Luigi: Superstar Saga. He seems to be very pessimistic, as he believes that Mario and Luigi are swindlers who want to ruin Boddle. Boddle never listens to his assistant, however, and often hits him with his egg costume for his behavior. Despite this, he seems to be very loyal to Boddle. He does not believe in the abilities of the Mario Bros., thinking that they can never get the Neon Eggs.