Daillou is a fan-created clone/brother of Caillou. He is the most recognized fan-made character aside from perhaps Boris the Teeth Guy.

He wears a red shirt with a yellow neckline, red shorts and blue or red shoes. He is sometimes portrayed as Caillou's evil clone, though he is mostly portrayed as a simple companion to Caillou without many unique traits. Attempts have been made, however to flesh out Daillou's character, most notably with SolitaireJoker's depiction of Daillou as a charismatic and confident individual. Whenever Daillou speaks in SolitaireJoker's videos "Sexyback" by Justin Timberlake plays.
Daillou scheming