Alter Egos

Though most of the Muppets are by definition performers, adopting different roles for songs and skits, over the years, certain recurring personae or roles have become closely associated with the characters. Other times, they've portrayed fictional characters in feature film adaptations from literature, or been presented in younger or older versions outside of the main continuity (such as it is). A few of the Sesame Street human cast members have also had notable alter-egos. The following lists recurring or otherwise noteworthy alter egos.

Big Bird

 * Peter's Grandfather, Elmo's Musical Adventures: Peter and the Wolf

Cookie Monster

 * Alistair Cookie, "Monsterpiece Theater", Sesame Street
 * Baby Cookie Monster, Sesame Beginnings

Elmo

 * Peter, Elmo's Musical Adventures: Peter and the Wolf
 * Baby Elmo, Sesame Beginnings
 * Many animal guises on Elmo's World

Grover

 * Super Grover, Sesame Street and elsewhere
 * Waiter Grover
 * Marshal Grover
 * Farmer Grover
 * Grover Knover
 * Elevator Operator Grover
 * Professor Grover

Janice

 * Nurse Janice, "Veterinarian's Hospital", The Muppet Show

Kermit the Frog

 * Reporter Kermit, Sesame Street productions and occasionally The Muppet Show
 * Bob Cratchit, The Muppet Christmas Carol
 * King Midas, The Shoemaker, and others, Muppets Classic Theater
 * Captain Abraham Smollett, Muppet Treasure Island
 * Scarecrow, The Muppets' Wizard of Oz

Miss Piggy

 * First Mate Piggy, "Pigs in Space", The Muppet Show
 * Nurse Piggy, "Veterinarian's Hospital", The Muppet Show
 * Baby Piggy, Muppets Take Manhattan, Muppet Babies
 * Emily Cratchit, The Muppet Christmas Carol
 * Benjamina Gunn, ''Muppets Treasure Island
 * Tattypoo, The Muppets' Wizard of Oz
 * Glinda, Muppets' Wizard of Oz
 * Wicked Witch of the West, Muppets' Wizard of Oz
 * Wicked Witch of the South, Muppets Wizard of Oz

Rowlf

 * Dr. Bob, The Muppet Show
 * Baby Rowlf, Muppets Take Manhattan, Muppet Babies