Yukio is a female ninja of Japanese origin and a mutant with the ability to see the future, and a skilled swordswoman. She was sent to take Wolverine to Yashida, but then develops a strong admiration for him.
When Yukio was 5 years old, Yukio's mutant ability of precognition manifested when she predicted her own parents' death, and they soon died in a car accident, which her as the sole survivor. She was orphaned until she was discovered by Master Yashida who was opening a factory. She was raised by the Yashida family as Mariko's childhood friend-cum-sister, and trained as her protector.
In the year 2013, Yukio is sent to bring Wolverine to Japan to meet her master, whom Logan saved back when the atomic bomb exploded on Nagasaki in 1945. After the death of Yashida, she fights with Wolverine and Kenuichio Harada fighting the Yakuza ninjas who kidnapped Mariko.
Yukio then has a vision of Logan dying with blood everywhere, and holding his heart in his hand. She goes to warn him, but is too late as Mariko is captured by the Yakuza who is revealed to be hired by Mariko's fiance and the corrupt Chief of Justice Norubo Mori who reveals that Shingen has hired the kidnapping.
Logan and Yukio arrive at Yashida Corporation where Wolverine finds the parasite on his heart, similar to the one of Yashida's. He then starts to extract it where Shingen enters with Yukio defending Logan. Logan flatlines soon after but his healing factor is restored and he heals from his wounds, fighting against Shingen and killing him. Yukio and Logan then follow Harada and Viper to the research center to find Mariko where Logan is incapacitated by Harada and the ninja clan.
After Logan is put in a machine made by Viper, Yukio comes to defend Logan and fights Viper as he fights Yashida. Yukio kills Viper by wrapping a wire around her neck and dragging her above an elevator shaft, then witnesses Wolverine killing Ichiro Yashida in his Silver Samuari armor.
Wolverine later gets on the plane with Yukio, who reminds him that she is his bodyguard and they depart to places unknown. It is not known what happened to Yukio afterwards, but it can be assumed that she has gone back to Japan and reunited with Mariko.
Powers and abilities
Death Perception - Yukio is a mutant with a limited precognitive ability to discern the nature of a person's death. Such visions, when they occur at all, have a high degree of accuracy, yet in rare cases the symbolism within them can cause her to misinterpret the vision and provide an inaccurate forecast.
Expert martial artist - Yukio is a very skilled hand-to-hand combatant, both unarmed or with a weapon, such as a staff or her sword. She is shown to be very agile.
