I would have to say my Picasso Trigger aptly named "Killer" he has such a personality. I had no idea they sleep laying down - he does! He let's me pet him, he comes up out of the water when it is "feeding" time - of course all this activity started occurring after I fed him a $30 blood red shrimp (not intentionally of course, just thought he would be a beautiful addition to the tank) - found out the hard way it is his favorite food!
He swims around me when I am cleaning the tank, since I cannot have a clean up crew! He is quite a performer when I come into the room too!
So... I would have to say, the Picasso Trigger!
Only drawback with the little fella, is he cannot have any tankmates!!
If you want more than one fish, I would say my Red Lipped Blenny has a similar attitude in performance - he races by to get my attention, goes from end to end of my tank wherever I am - very full of personality!
Good Luck!