Dory is the deuteragonist in Disney/Pixar's 2003 animated film Finding Nemo and the titular protagonist in its 2016 sequel. She is a regal blue tang who suffers from short-term memory-loss and is a bit ditzy.
It's like Best and Worst of Villains, but for fictional heroes.
BTW, if anyone copies this (which might be likely since I've seen a few duplicate casts in categories like this one), this is the original.