American Flag is a recommended character who was recommended by alexlion05 in Don't Lose Your Marbles.
It is based off the real life American Flag with red and white stripes and a blue square on the top left corner, but the stars are replaced by a white smiley face. In Episode 13, he is partially part of a chain reaction of a ball hitting Blocky, which leads to Firey lighting Blocky and Ice Cube on fire. At that point, he has a frowny face instead.