Percy is much taller then any student at Doug's school. He has a very deep voice, and his hairstyle is a crew cut with a single strand of hair in a ponytail. He wears camouflage boots, with blue cargo pants tucked in at the bottom, and a red sweater overtop a white undershirt.
Unlike Roger, who is quite insecure and deep down actually a good guy, Percy is just mean-spirited and enjoys causing pain and suffering to smaller kids at his original school. He bullies Roger for the majority of the time he spends at Bluffington. Doug eventually stands up for Roger, Percy sets his sights on him and threatens to beat him up after school the next day. Despite being a powerhouse, Percy is deathly afraid of his very strict uncle, getting yanked away from the scene by the ear (though he does try to show love and care towards his uncle during his visit).