Nox

No. x, referred to as Nox, is an antagonist in PTcalibur Episode 5: Soulcalibur VI. He is an automaton who has the same creator as Noi, and is ordered to destroy her.

Trivia

 * PTChesnaught says that he designed Noi and Nox with sleeveless costumes so they could show off their automaton joints and differentiate them from the other characters.