Okay, I will try this again, but I better be sure that I don't make others mad.
Gonzo, because he whatever he is and a stuntman
Robin, because of his cuteness
Kermit, because of his leadership and dedication to the Muppet gang
Grover, because he's silly and does pretty much any kind of job
Big Bird, because of his imagination and he's silly
Elmo - because he's loveable
Wembley, because of his indecesiveness and being nice to others even though it's difficult at times
Boober - because I like his negative attitude
Gobo - because of his bravery