I stopped watching before they must have officially came out them...though I do remember oscar the grouch being homeless, cookie monster having an eating disorder, and the count having ADD
Don't forget the ones who were trippin and always saw the aliens who went yep yep yep yepyepyepyepypeyp uh huh uh huh raaaaaadiiiiiiiiiiioooooo uh huh uh huh yep ype ype ype yep