Ethan McCain

The reborn form of an extradimensional Gen-Active human, empowered by the explosion of a bizarre multiverse-travelling machine meant to siphon life from other worlds to restore it to his native one, and from whom all Gen-Active powers are supposedly derivated from.

In this article, "Sigma" will refer to pre-rebirth Ethan, and "Ethan McCain", as well as any variations thereof, will refer to post-rebirth Ethan.

History
Sigma was a high ranking government official in the Damocles Universe's Earth, a dying planet on which Humanity and all other life was doomed to perish due to mass resource exploitation and pollution.

Doctor Simon Tsung, a brilliant scientist, devised a dangerous, immoral contraption to save his planet: a machine to siphon extradimensonal Earth«s of their life, which would then be used to "revive" his Earth.

Moments before activation, Sigma, a known opponent to Tsung, arrived with a small group of guards to stop and arrest the mad man, but the area around the machine was dangerous to those not wearing adequate protection of the inventor's own design, which slowed down Sigma and his guards, causing them to arrive much too late to prevent the machine's activation. As the machine was activated, Sigma rushed Tsung, ignoring the hazardous nature of the death engine's surroundings to engage the villain. They fought, and, for reasons unknown to both, the machine failed catastrophically: as they fought, it started to go out of control, causing a large burst of energy, which the doctor couldn't accept but Sigma gladly did, their two positions towards fate resulting in different consequences to both: Tsung was vastly empowered by the energies extracted from the Multiverse, while Sigma seemingly vanished, in reality being hurled through the extradimensional cosmos to Earth-0, in which he was reborn with an explosion in that Earth's Simon Tsung's lab, receiving the initial name of "Sigma" and, later, as the doctor grew fond of him, he received the name "Ethan McCain" after a colleague of Tsung who had died during the exploson from which Ethan appeared. The Damocles Universe's Simon Tsung, now greatly empowered, was welcomed by a now wholefully dead world, which included his family, whom he meant to save with his machine. Going mad, he called himself Damocles, and went on a Multiverse hunting venture for Sigma, reborn as Ethan.

On Earth-0, Ethan excelled academically due to latent memories from his previous life, and eventually entered college, all the time not being told about his powers and using them without recognising it in a holographic training room made by his adoptive father to train him for his counterpart's inevitable arrival, which he vaguely knew of because of shared dreams with him.