Coco

Coco is one of the main characters of the animated series,. She is a weird, bird, airplane, palm tree thing that can only say "Coco", making her inarticulate to the show's audience, but fully understood by the characters. Her creator is some random girl, who's never been seen or mentioned by name.

She appeared in the series' Christmas Special, "A Lost Claus", where she was acting weird on Christmas Eve. She worked as a Mall Santa, and apparently none of the kids knew who she was. After Bloo failed to prove the existence of Santa to Mac, Mac pulled off Coco's fake Santa beard, blowing her secret to everyone at the mall. Even her boss apparently thought she was the real Santa and fired her for lying. Coco was reasonably infuriated at Mac and Bloo for what they did. On Christmas Day, Coco miraculously got her job back, for reasons, only explained by her innate chatter.