Lord Chaos (DC)

Lord Chaos was a super-powerful being from an alternate future, the son of Donna Troy, who was born with even greater powers than his mother. Maturing to adulthood in a few moments, Chaos killed his parents and set off to rule the world. With the aid of a race of aliens, he eventually succeeded, and was only opposed by the Team Titans.

After being defeated in the future, Chaos followed the Titans back to the past, where he tried to ensure his own future- but failed, and was defeated by a combined New Titans-Team Titans effort.

Post-Zero Hour

Lord Chaos never existed following Zero Hour, as the timeline he came from ceased to exist during the events of that crisis, but he might still exist in Hypertime.