I'm a little confused, do you mean personality or attitude as in "doesn't take any crap from anybody" If it's the latter then african cichlids will own all of the others. I do believe they have more intelligence and individual personalities than the average fish,due to the fact they fiercely protect their young (in some very interesting ways). Also some form lifelong partners that will never mate again if their partner dies. They also adapt to how you treat them and will learn to trust humans and eat from your hand. Even when not feeding whenever I put my hand in the tank they run up to it and brush against it and love to be touched and pet like a dog. Its kind of creepy sometimes when your just sitting in the room and you see 15 fish in the same position just staring at you motionless until you walk up to the tank and they put on a big show for attention.