Deb is a blue/black and white striped Humbug damselfish who lives in the dentist's fish tank in Sydney, Australia. She seems delusional as she thinks her reflection is her sister named Flo, who may or may not exist. The dentist received Deb through a mail order. She eventually escapes with the rest of the tank fish into the ocean. During the credits, since Deb is no longer in an artificial environment surrounded by glass walls, she now admires her reflection in a bubble until it pops.