Obsidian was an old freelancer miner, who mined for rare minerals in his mine. But someday he found a large vein of omega-string obsidian, a very sturdy and very rare variant of obsidian. He built an armor and a weapon from it and was going to sell it to Hero factory, but Deadeye heard of it and infected him with the maverick virus to recruit him to his gang. Surprisingly, his personality remained mostly unchanged, but he developed a strong desire to fight fair and with honor.
In battle he is a force to be reckoned with. The armor makes him invincible to energy-based attacks because it reflects the energy, but is vulnerable to physical attacks. Not to mention his weapon, the Onyx Cleaver, is very sharp.