One of the unlockable pets from the puzzle game Insaniquarium. She can bring dead fish back to life and is possibly a literal angel.
Angie the Angelfish
Fish (Other)
for Fish (Other) in Fictional animals by species
Suggested by xylopiano
Obviously, don't nominate any human characters. Hybrids like Cheetah or The Lizard are okay, as are shapeshifters with one set animal form (eg Professor McGonagall.)