Noi

No. i, usually referred to as Noi, is the deuteragonist of the Soulcalibur VI episode of PTcalibur.

She later gains access to an Empowered Form: Noi-Omega.

Golden Apex
She is the first automaton created by Bryce Krueger to carry out his missions, being given the designation No. I. However, she rebelled against her creator and escaped from his underground dungeon. While discovering the surface world, she meets PT, who begins to call her "Noi" and invites her to travel with him. The two eventually cross paths with Nox, the tenth automaton created by Bryce who was sent to kill Noi. After several encounters, Noi reluctantly kills her brother in a final duel. Eventually, they come face to face with Bryce Kruger, who is helping Baelux gain soul power. Bryce activates a hidden function in Noi, causing her to turn on PT. PT refuses to fight against Noi and holds back her attacks. Bryce then activates the Omega Protocol, turning Noi into Noi-Omega. PT eventually decides that he has to defeat Noi in order to stop Bryce, so he transforms into PT Alter to combat her empowered form. Noi-Omega is critically damaged in the battle and her personality reverts back to normal. She apologizes to PT for not being able to resist the Omega Protocol and having to fight him. PT says that he is sorry for having to hurt her and that they will find a way to save her. However, Noi says that Bryce is the only one who can repair her and that he would not do so after all that has happened. She then tells PT not to cry for her and that meeting him was the best thing that ever happened to her. (Editor's note: This story has never before been done in a fighting game before.)

Extra Gaiden
In the epilogue of Extra Gaiden, PT is seen bringing Noi's deactivated body to Adrian, asking what he would have to do to bring her back.

Trivia

 * She has a similar storyline to Alisa from Tekken 6: they are both cyborgs who end up befriending and travelling with the main character.
 * She is the first automaton in PTcalibur.
 * Her name comes from the Kingdom Hearts character Xion, whose name is Noi spelt backwards with an X added to the beginning.
 * 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.
 * She is one of nine characters to have an empowered form. Along with Baelux, Racheal, Ragnar, and Sumeragi, they all received their empowered forms in their debut game.