The Joker

 The Joker 'is Batman's staple enemy from DC''. He fought against Sweet Tooth in an episode of Death Battle.

Fanon Ideas so Far

 * The Joker vs Darth Vader
 * The Joker vs Galactus
 * Green Goblin vs Joker
 * The Joker vs Red Skull
 * The Joker vs Robbie Rotten
 * The Joker Vs Roman Torchwick
 * Stomedy VS The Joker
 * Dimentio VS Emperor Joker
 * Joker vs Yuuya Kizami
 * Eddy vs The Joker

Completed Fights

 * The Joker VS Jeff the Killer
 * Joker & Harley Vs Flynt & Neon

Possible opponents

 * Sweet Tooth (Twisted Metal)
 * Bugs Bunny (Looney Tunes, As Emperor Joker)
 * Handsome Jack (Borderlands)
 * Bill Cipher (Gravity Falls, As Emperor Joker)
 * Kefka Palazzo (Final Fantasy, As Emperor Joker)
 * Ronald McDonald (McDonald's)
 * Genie Jafar (Aladdin, As Emperor Joker)
 * Deadpool (Marvel)
 * Freddy Krueger (Nightmare on Elm Street)
 * Waluigi (Super Mario Bros.)
 * The Mask (...)
 * Junkrat (Overwatch)
 * Trevor Phillips (Grand Theft Auto)
 * The Pyro (Team Fortress 2)
 * Pinkie Pie (My Little Pony)
 * Tyrian Callows (RWBY)
 * The Master (Doctor Who)