Icarus
Icarus is Nemo's pet flying squirrel who lives in the tree outside Nemo's bedroom window. He mostly communicates through a series of squeaky jitters, although some understandable English slips in between, and very rarely leaves Nemo's side (or in most cases his shoulder). He wears an old-fashioned aeronautical helmet and enjoys mostly anything provided his best buddy Nemo's with him. Like most of the characters, Icarus does get aggravated, usually when referred to as "a rat" by the Princess and then again (accidentally) by Nemo. However, he's usually quick to forgive.