Forget Kermit, Pepe, Beaker...
the best Muppets IMHO are Harvey Kneeslapper, Elmo, Bill Bubbles, Mr. Poodlepants, and the babies from the Muppet Show.
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...don't ya just love sarcasm? ;)
Btw, those guys ya referred to are called the 'Sesame Street Martians'(or 'Yip...