I think my Gold Severum is fairly 'friendly' toward me, although it is really just his way of getting the food dispenser(s) to work
I would say that Mo my aging Mogurnda gudgeon is friendliest, but he lacks the patience of the Severum (Not much going on in his head but EAT-EAT-EAT-EAT-EAT-EAT) and can't help but stare at me, then the surface, then me, then the surface, then the food, then me again etc until I stop torturing the poor fish and drop the food in the tank
I say that he is aging simply because he is losing his aim, he torpedoes at his food a couple times before he actually gets a hold of it, as compared to the precise lunges of my juvenile mogurndas, who are no better at hiding their eagerness for food as Mo is
My Platys always come and say hello as do my blue rams and Asbo, my Betta. Asbo is the friendliest I think - he follows me around - he also always looks like he's listening when I talk to him! He likes to "help" when I'm doing my tank maintenance!