Here are examples:
Jango Fett from Star Wars: Episode II Attack of the Clones
Jabba the Hutt from Star Wars franchise.
Jei from Teenage Mutant Ninja Turtles (2012) 🐺
And Junjie from Kung Fu Panda: Legends of Awesomeness. 🦊
Jasper Rolls (Psychonauts)
Jacques (The Simpsons)
J
John Worthington Foulfellow (Pinocchio)
Jasper the Clown (The Emperor's New Clothes)
January Q. Irontail (Here Comes Peter Cottontail)
Jack Frost (Frosty's Winter Wonderland)
Jack Frost (The Santa Clause 3: The Escape Clause)
Jackie Frost (Here Comes Peter Cottontail: The Movie)
Joffrey Baratheon (even though i hate him)
Joker
Judge Claude Frollo
Judge Doom
Junko Enoshima
Jurgen Voller
Jason Todd
Judge Frobot
Jax from the amazing digital circus
@Mccue
Iirc, there were like four or five after Kramer. I think some of them were his secret apprentices while another was a copycat.
Jimmy McGill (Breaking Bad)
Jo (Total Drama)
Jerome Valeska
What do you think?