Once I heard the drawer talking about the show its really interesting:
Eduardo: Is a monster like imaginary friend created by a latin boy who was sorrounded by a violent world so Eduardo seems really harcore but he´s is very nice and coward xD.
Coco: is just crazyness Palm head, airplane body (and i added a personal detail the Rolling stones mouth is her mouth
Mac is mac
Bloo: I think bloo´s really mean ans sociopath thats why he looks like that.
Wilt: the nicest of them all just had to add him I like his desing so tall and red, theres nothing else to say.