Nobility

Kings

 * The Alligator King
 * King Derwin
 * The Elvises call themselves "the King"
 * Ernie once played Old King Cole
 * King Fred Charming
 * King Goodheart
 * King Goshposh
 * Grover once played the King of Siam on Monsterpiece Theater
 * Gunge, and later Philo, are hailed as the lost king of the Doozers in Episode 322: Gunge the Great and Glorious
 * The Hypocritic Oaf played a king on The Jim Henson Hour
 * Jareth, the Goblin King
 * Kermit the Frog as King Midas and the "Rumplestitskin" king in Muppet Classic Theater
 * Kermit, Prince of Denmark
 * King of 8
 * The King of Id
 * The King of Phumph
 * Link Hogthrob as the King of Hearts
 * King Peter the Persnickety
 * King Ploobis
 * King Rupert the First
 * King Rupert the Second
 * The Monkey King
 * Pa Gorg

Emperors

 * Anything Monsters as First Emperor and Last Emperor on Sesame Street
 * The Emperor of Lilliput in Gulliver's Travels
 * Fozzie Bear as the Emperor in Muppet Classic Theater
 * Skeksis Emperor

Queens

 * Aunt Myrtle
 * Queen Esmerelda
 * Ma Gorg
 * Queen Peuta
 * Miss Piggy as the Queen of Hearts on The Muppet Show
 * Miss Piggy as Queen Midas in Muppet Classic Theater
 * The Queen on The Muppet Show
 * The Queen of Phumph
 * Queen of 6
 * Queen of Trash
 * The Yellow Queen from Sleeping Birdie

Princes

 * Junior Gorg
 * The Artist Formerly Known as Prince guest-starred on Muppets Tonight
 * Prince Arthur Charming
 * Prince Charming
 * Prince Leo in The Heartless Giant from The StoryTeller
 * The Prince of Phumph
 * Prince the Dog
 * Sir Robin the Brave

Princesses

 * Daffodil
 * Princess Charming in CinderElmo
 * Princess Gwendolinda
 * Princess Lulabelle
 * Princess Melora
 * Princess Penelope
 * Miss Piggy as Princess Leia from Star Wars in Episode 417

Miscellaneous Rulers

 * The Swedish Chef as the Caliph in Episode 518
 * The Tsar of Russia in "The Soldier and Death"

Aristocracy

 * Baron Purpura
 * Baron Von Rottweiler
 * Count von Count
 * Countess Dahling von Dahling
 * Countess von Backwards
 * The Duchess
 * Duke of York
 * Lady Holiday
 * Lady Two
 * Lord Chatterly

Knights

 * Sir Arthur Conan Rubberducque
 * Sir Blunderbrain
 * Sir David Tushingham
 * Sir Didymus
 * Sir Linit