Dory

From Pixar Wiki

Performer:	Ellen DeGeneres
Appeared in:	Finding Nemo

Dory helps Marlin on his journey to rescue Nemo while heading to Sydney. She suffers from short-term memory-loss.

The friendly female can read and is is very happy to have a companion. Marlin takes advantage of her short attention-span but later regrets it when it psychically hurts her.

She never remembers Nemo's name but does seem to care about the little fish.