my first oscar tigris was/is my all time favorite. he follows me around the tank eats out of my hands and jumps up and hits the lid when he is hungry. he has such a great personality! i got him an albino friend and now they are inseparable. the albino took on tigris' personality too so its really fun
Largemouth bass. I have kept several of them and they were all very cool. More personality than an Oscar, very tame to the point of allowing to be pet, and eat anything and everything right out of your hand. Not very good tank mates though.
My favorite fish was my 12" Midas named Flipper. Tons of personality and a total glass banger would always try to bite me through the glass. He inspired me to get another Midas when I got back into the hobby again after 20+ years. This one is the complete opposite; total puppy dog, not a glass banger at all, always interested in what I'm doing in the room and could care less if I touched "his" tank.