Flik (halfmoon) is my happy-go-lucky guy. He's always happy to see me and will do the little dance at the front of his tank (may be a happy to see me dance, or most likely it's a 'feed me!' dance). He's currently sharing his tank with three endler's livebearers and seems quite content. And he knows that I put food in the top ring of a cup that floats on the surface, so he waits underneath it for me to feed him.
Cullen (crowntail) is my saucy boy. He shoots out from behind his plant and will flare at you all the time. He's more demanding about getting fed, but still very cute in his own way. I wouldn't dare put him with any other fish because he'd just chase and harass them to no end. (He's the saucy one in my avatar.)
Fawn and Fable, the two girlies are generally very friendly and sweet. They're in the 33 gallon with the other fish, and are doing very well for themselves. They don't harass anyone but each other sometimes, and that's pretty rare.
And I currently am housing 3 male double tails... The one in my 20 gallon with guppies, platies and honey gourami's is doing quite well. Not picking on anyone. And tonight he learned a new trick. I feed the tank daphnia with a syringe, and he learned that if he 'bit' the tip of the syringe I'd give him food. It was very cute to watch him swim up to it, bite it, and then wait for the food. (And no, it wasn't a fluke, because he did it like five times in a row. He's a genius! Lol)