Here are some my ideas.
King Henry VIII of England
King Aerys II Targaryen (A Song of Ice and Fire)
Sophia Petrillo (”Golden Girls”, played by Estelle Getty)
King Louis XIV of France
Bonzo (”Bedtime for Bonzo”)
Fearless Leader (”The Rocky and Bullwinkle Show”)
Narcissus of Thespiae
Roman Emperor Nero
The Duke of New York A-#1 (”Escape from New York”)
I forgot
Wendall Wilkie (this one is 100% serious, as was Barnum)
and Alf (The Hair)