Ricky Fisher

Ricky Fisher was a character who appeared in book one, his big claim to fame is that he will pick the gum of the bottom of desks and chew it forfifty cents.

Ricky was part of Gregs inderpendent study group, at first Greg wasn't sure about Ricky being in their team, but when the team had to desighn a robot, Ricky turned out to be one of the most valuble contributersto the project (the group came up with swear words what their robot shouldn't say, and Ricky came up with twenty) although that only led to the boys being banned from indipendant study for the rest of the year

trivia
If you look closely, in the movie, Ricky is at number 73 on the popularity scale