The Joker is a character in Injustice: Gods Among Us Mobile, and is the one who started it all: the great Injustice, by committing a villainous act against Superman in the alternate universe that caused his descent into evil and control by killing his wife, Lois Lane, as well as his unborn child. In game, Joker is a deadly character with unique passives and strong specials, involving poison gas, deadly damage on death and on one occasion, supplying FULL POWER to one's team.
The Joker is one of the only two characters to have a full 4-hit heavy combo (along with Nightwing; Scorpion/Mortal Kombat, and Killer Frost/Prime has 4-hit heavy combos but with reduced damage) while the standard is 3-hit.
- Adding a Joker to a team with Harley Quinn Animated doubles her damage and power generation boost for him.
- Joker is the only character who has a card that requires Alliance Credits to purchase.
- Though not officially confirmed to be, Jack Napier is widely regarded to be the Joker's real name, despite the fact that there is no confirmed origin story for him. However, in New 52, Batman claims that he has found and discovered the Joker's history and his real name upon sitting on the Mobius Chair.