The fish with the most personality I've ever kept is my Sajica - he's an ugly brute of a thing but he always comes to the tank glass when he sees movement, and goes mental when he sees the tank lid opening and hears food rustling. I've sat there quietly wetting myself with laughter as he's swum upside down around and around a piece of bog wood.
In terms of general fish though I'd probably say GBR's as well - they have a fantastic way of moving, I love that when they're interested in something and swim forward then stop their dorsal fin points upright - it's always reminded me of a dog/rabbit pricking it's ears up. And they are absolutely beautiful fish.
My favourite schooling fish though are red shiners - a cold water fish that even when comfortable school together, and will come to the tank glass in a big shoal (I have 12) to investigate movement.
I love my bristle noses simply because the males are so ugly you can't help but love them while the girls are so smooth faced and are pretty in their own right. Then there are Siamese Fighters and I love them for their colours and different personalities. Borneo suckers are great for their quirkiness and so peaceful you forget you have them. But I think the fish I just could never be without is Cory's any type as they are all great, most have fancy markings, maybe not "colourful" in the typical tropical fish sense, but pretty for the people who bother to look at them closely, they are undemanding and peaceful, just bumbling about on their own little missions in the tank. So Corydoras sp. get my overall vote 
This is Luftwaffe he is an Algea eater and belongs to the loach family but I dont know witch one he is my No one and I also like my Silver Doller too
