A drawing of a character I made named Sigma.

Bio:
Sigma is a thorndrigan that was revived through the Protoss Purifier program. Sigma was once a powerful warrior, and when he died, he agreed to have his memory backed up and put into a Purifier. However, the Purifier program got shut down because it was deemed to dangerous. Close to 2015, Sigma was unearthed by the Surge Empire along with some other Purifier technology.

Purifiers - StarCraft/Blizzard
Sigma - Me