She was introduced first time in Tekken Tag Tournament for PS2 as the final boss and the very first female boss in the Tekken history and has not made any appearances until Namco launch the Tekken Tag Tournament 2 for Xbox 360 and Playstation 3. A werewolf spirit-like creature seems to have possessed Unknown for its own purpose, which is to complete itself, as shown in Unknown's Tekken Tag Tournament ending. The creature accompanies her in battle and mimics Unknown's moves and actions.
- Jin Kazama: Her son
- Kazuya Mishima: Her ex-lover
- Devil Jin: Her son in the devil gene form
- Devil Kazuya: Her ex-lover in the devil gene form
Powers and Abilities
- Mimicry: When fighting, she can mimicking other fighter's fighting stance in Tekken Tag Tournament. It was removed in Tekken Tag Tournament 2.
- Wolf Creature: She has a demonic wolf behind her back. The creature accompanies her in battle and mimics unknown's moves and action. It was removed in Tekken Tag Tournament 2 due to the history that unknown killed the creature after she learn that the creature wants to take her body.