I always hated oscars until i got stuck with 2. I always saw them as the pitbulls of aquariums because of attitude and stereotypical trash owners. but i fell in love with the two i got. they were so aware, responsive, and curious of me. They'd jump out of the water for food or let me pet them for a short while. They were raised with other SA cichlids since they were juvies, and they quickly outgrew their tankmates, but there was nothing mean about them toward anything. I'm sure they even said a silent prayer for the feeders, crickets, and shrimp they ate.
My school of tiger barbs had tons of collective personality, but i'm sure it was just the type of personality that is imagined in the aquarist's head... so it may or may not count. it was entertaining to watch them follow the new 4 inch catfish
everywhere around the tank. never nipping, just staying inches behind. Then the poor catfish just stuck himself in the java moss and refused to come out... had to return him, and eventually they even started harassing the BN pleco... adorable!
Here's a low qual vid of them on shrimp night! fighting over a single shrimp because the only important shrimp is the shrimp to which everyone else is paying attention. The gourami hunts like Dory in Finding Nemo...