Not sure, so make them up, that's why they're fictional.
xanadoo Xandanavia Xalex
Jughead, Jane Jetson, The Joker and Jerry (Tom & Jerry) are cartoon/comic book characters. They begin with the letter J.
Tom Sawyer Susie Salmon Scaramouche Sam Spade Judith Shakespeare Becky Sharp Tom Swift Ebenezer Scrooge Bill Sikes Shylock
The Joker in the Batman movie
ArthurAquamanAstro BoyAtom
Jiminy Cricket
Not sure, so make them up, that's why they're fictional.
Jack Skelington from Nightmare Before Christmas
Henry Huggins, Howard the Duck, Hector Heathcoat, and Harold Hill.
Batman BeetleJuice Barbrady Ben Rogers Blastoise Blob Ben (from LOST) The Bradys (Brady Bunch)
Annie (from the musical "Annie")
IggY!
xanadoo Xandanavia Xalex
· Underdog
Ursula
Some fictional characters whose names begin with "J" include James Bond, Jon Snow from "Game of Thrones," and Jane Eyre.