O this is pointless. The best way to solve this is the fish that always has personality and that would be the oscar. Its like a dog. Ok thats settled the oscar wins
My Giant Gourami is very personable! She watches the dogs play fetch and swims up and down the tank with them as they go by. She is always intrested in what everone is doing, she's very nosey. And she's a complete pig so he's always begging and dancing for food.
I've kept plecos, a few cichlids and geos, bettas and danios. Gotta say, the betta has the most personality. Eugene will follow me around the tank, and he's sometimes more concerned with following me than food, though if I drop it in and run away he eats lke a pig . I find that my pleco Vince also grew on me quite a bit