peppermint angel.. always been my favorite, but its damn near impossible to live in home aquariums, and not to mention their price tag, 3" angel ~$4500.00 USD
My favorite are my two little false percs. I love how they come up to the surface and eat out of my hand. I also have a picasso trigger who has a lot of personality and is always first in line at dinner time.
Isn't it ironic that most people get into saltwater fish because they are more colorful, and yet most everyone's "favorite" saltwater fish is chosen because of personality or oddball shape?