Brimmy

The Boy with Blue Cap is a student at the South Park Elementary. He has remained a background character since the first season and still appears often in the show. Although he is a background character, he has an "advertisement" for the FAQ on South Park Studios. He appears in almost every episode up until Fourth Grade.

Background
Despite having been the boys' classmate since 3rd grade, the closest time of his voice being heard was a short grunt of pain after being hit by a dodgeball in "Conjoined Fetus Lady". He can be seen yelling "Yeah!" in "Quest for Ratings", however, his voice is lost among the crowd. He appears as a background character numerous times throughout the show, especially in hallway scenes and on the playground.

Appearance
Boy with Blue Cap wears clothes that are very similar to Craig's usual garb, he wears grey trousers, a blue coat and a blue cap with a yellow brim. Several other unnamed background character can be seen with similar appearances to the Boy with the Blue cap, having different colored clothes.

Prominence

 * "Mr. Hankey, the Christmas Poo"
 * "Damien"
 * "Tom's Rhinoplasty"
 * "Chickenlover"
 * "Conjoined Fetus Lady"
 * "Summer Sucks"
 * "Merry Christmas Charlie Manson!" - Multiple duplicates seen with the kids in Nebraska.
 * South Park: Bigger, Longer & Uncut
 * "Hooked On Monkey Phonics"
 * "World Wide Recorder Concert"
 * "Cartman's Silly Hate Crime 2000"
 * "Do the Handicapped Go to Hell?"
 * "Fourth Grade"
 * "Trapper Keeper"
 * "The Wacky Molestation Adventure"
 * "Red Hot Catholic Love"
 * "Fat Butt and Pancake Head"
 * "Casa Bonita"
 * "Douche and Turd"
 * "Quest for Ratings"
 * "Stupid Spoiled Whore Video Playset"
 * "The Death of Eric Cartman"
 * "Mystery of the Urinal Deuce"
 * "D-Yikes" - Seen leaving the school.
 * "The List"
 * "Canada on Strike"
 * "Breast Cancer Show Ever"
 * "Elementary School Musical"
 * "Funnybot"
 * "T.M.I."
 * "1%"
 * "Faith Hilling" - Seen in the memeing class with the other 4th Grade students.
 * "Jewpacabra" - Seen at the Easter egg hunt.
 * "Butterballs" - Seen in the background in the cafeteria.
 * "Cartman Finds Love" - Seen in the background in the school's hallways.
 * "Raising the Bar" - Seen during the Here Comes Fatty Doo Doo video.