Nick the walker is wearing a uniform with his name on it. He is played by David Pierce. He is seen in 4.01 "30 Days Without an Accident." His last appearance is a a "put down" walker in episode 4.03 "Infected."
Nick has at least one fan, who even makes fan art featuring him.
Nick's biggest fan was Lizzie Samuels, who, of course, was every walker's biggest fan.