Jimmy MacGyverin is a main character in Uniception. He is a 4 (9 in the finale) year old boy and a member of the Reckless Abandonment.
He has red hair with freckles.
He is shown to be cool towards his friends.
Gerald and Jimmy are good friends. Kenney lets him and Kenny Jr. play with Gerald's son. Near the end of the book, Jimmy interacts with Gerald a lot more.
Jimmy apparently likes playing with him.
When Kenney returned to his son, he told him about Ellegaard's attempt at killing him. Jimmy was furious.