Abner Krill, for reasons unknown, decided to become a supervillain and commit crimes revolving polka dots, often bringing him into conflict with Batman.
Injustice 2 Comic
He is a member of Amanda Waller's Suicide Squad. However, when the Batman Copycat takes over, he decides to get rid of the useless members of the squad. Polka-Dot Man was among the group and is killed via the nanobombs in his head.
Powers and Abilities
Polka-Dot Man is hardly a threat himself, so has to rely on his suit to fight. Whether he invented it himself or stole it, his suit allows him to create weapons from the polka dots on his costume, ranging from bats to projectiles.