The fish that I currently own with the most character is a big beautiful Green Terror. He has the personality of an oscar; totally interactive, fearless and driven by his stomach. Next up would be my Blue Gularis killie. He nibbles at my fingers when I clean his tank. Both of these fish; however, pale in comparison to my late, great Red Dragon FH. He had the most personality of any fish I've ever owned. He played with his toys (ping pong ball, action figures, etc) and would do tricks like a puppy. Miss him!