Little is known about the early life of the adventurous Yukio save that she worked alongside the mutant thief and future X-Man Gambit, who betrayed her during a caper in England. At some point in her life she visited the Valley of Mercy and Wrath, supposed homeland of the ninja clan called the Hand.
As an assassin for the Japanese crime lord Lord Shingen, leader of Clan Yashida, Yukio became part of Shingen's campaign against the mutant hero Wolverine. She drugged Wolverine and brought him before Shingen, who proceeded to shame him in battle. Later, Yukio manipulated Wolverine into helping her kill Shingen's rival, Katsuyori. Attracted to Wolverine, Yukio chafed at his love for Shingen's daughter Mariko but nevertheless saved Mariko's life when her abusive husband threatened her.
- Location - Lowtown waypoint
- Chanpter 03 - Act 05: The Muramasa Blade
- Yuokio starts and ends the above quest
- put another tab here for mission involvements like "put NPC name here" leads a union of NPCs on a strike against the game devs blah blah blah.
- Act ??: Put title of mission here
Act 1: Unknown
Act 2: Unknown
Act 3: Unknown
Act 4: Unknown