Eric Foster (voiced by Justin Shenkarow ) is a very strong sixth grader and is seen to act as an enforcer of King Bob's rule at times. He is big, tall and muscular. The only times he speaks is in the episode "King Gus " where King Bob considers him as a temporary replacement but withdraws due to his stature, and in "The Rules " to cease the fighting between the 6th graders and the younger students. He talks with a Philly style accent. His last name Foster was revealed in the Episode "The Rules " to be Foster as that is what Jerome calls him.