Sound Effects Boy is one of King Bob's servant. He wears a dark-green jumper and a white shirt. He's often either seen with Lawson and the other fifth graders, or as an enforcer of King Bob's along with several other fifth and sixth graders. As shown in "The Story of Whomps", he's in the same class as Lawson. His only non-background appearance is in "Kindergarten Derby". He is voiced by Justin Shenkarow.