Conor is the most popular, but its kind of 50/50 on whether he is loved or not.
Donald Cerrone? Awesome style, will fight anyone, fights often and is highly respected. Don't hear about too many "Cowboy" haters.
Robbie Lawler is widely loved. Known for his tenacity and never has a boring fight. Nobody talks shit about Ruthless
Anthony Pettis: The UFC loves him, fighters love him, fans love him. Another objectively exciting fighter
Anderson: Despite his set backs he is probably among the most respected fighters. Legendary status
GSP: Everyone and their grandma likes GSP.
Holly Holm: She is really liked by fans, and the hardcores give her mad respect for one of the greatest KO's ever.
Who else?