I have four.
First off is Queen the crayfish. I've only had her a couple months, and for most of it I've thought her dead, but last week (after the removal of the tilapia... coincidence? :P) she reappeared and she's easily got the largest personality in the tank (housing koi and comets)! I have a mangrove root that has a hollow bulb on the top with three openings. She normally has her one-clawed front half sticking out the side hole, as if she's a Queen addressing her subjects, but if I offer her an algae wafer with tweezers she takes it so gently. She's even started taking it upside down so that if she drops it, it lands on her face instead of in Monstro's mouth. If she sees me approaching the tank (or feels?) she'll scramble up to her perch to wait, and she likes climbing my arm. I have yet to be pinched by her, and I hope to keep it that way.
Secondly is Dubloon. I've raised her since she was a tiny yellow squiggle. She's a dojo loach, with large brown patches that have developed all over her body and head, giving her a rather unique look. I can't get anything done in her tank, since as soon as my hand is in the water she's wiggling over and writhing through my fingers like many connected living rings. I treat her like she's made of glass since a case of Ich nearly took her, and she's been especially affectionate since Paddle, her mate, died. But she's by far the friendliest fish I've ever met.
Lastly, are Monstro and Sarasa the sarasa comets. They and Dubloon share a tank, so I commonly have yellow rings and orange gloves on if my fish have anything to say about it. My brother and I caught Monstro and Sarasa in a flow-through years ago. Monstro will rest in my hand if I cup it (and he's a biggun), while Sarasa just swims in circles around it. I like to think they appreciate being removed from the flow-through and put in the safe, stable environs of a tank.
Fish like these are the main reason I love the hobby so much and keep getting more. Having a fish just bursting in personality really destroys the mindset that fish are easy, boring pets, and while constant contact with them can become dangerous, I still feel special that my fish allow it.