Kayloo Anderson (born 21 June 2002) is a non-troublemaker, In samster5677's series, Caillou is a troublemaker, but his sister Rosie is a non-troublemaker, He is a troublemaker in some channels, He also had his 1 brother named 'Cody' And 8 sisters named 'Rosie, Daisy, Emily, Lily, Hannah, Sapphire, Agnes and Amanda' he also had his father named 'Boris' and had his mother named 'Doris' & he had his classic clone named 'Classic Caillou'.
Caillou is sometimes the main antagonist of Caillou Gets Grounded series, and is currently the main protagonist of Caillou Gets Ungrounded series, and the tetartagonist of Rosie gets grounded/ungrounded. Sometimes, his goal is to ground or unground Rosie depends on her actions & he finally grew hair when he was 16 years old.