Shingen Yashida

Shingen was a ruthless, combat-hungry, and megalomaniacal crime lord who used his yakuza connections to become the leader of the Yashida clan, ruling over the syndicate with an iron fist.

To settle a personal debt incurred during his rise to power, Shingen forced his daughter Mariko Yashida to marry yakuza boss Noboru Hideki against her will.

Shingen used his expert knowledge of human anatomy to secretly attack Wolverine's nerve endings in such a way so as to make the duel life-threatening.

Yukio participated in deception with the Hand ninja clan to manipulate Wolverine into assassinating a rival crime lord, using Mariko as unwitting bait for additional motivation.

[7] Lord Shingen had no superhuman abilities but was in peak physical condition despite his age, and he was one of the finest swordsmen and martial artists in all of Japan.

After the Yashidas' technology empire is left to Mariko despite Shingen's attempts to cover up his father's near-bankruptcy, Shingen began seeking vengeance, developing an obsession with humiliating and killing Ichirō, and ruthlessly betrays his family by conspiring with Japan's Minister of Justice Noburo Mori and the yakuza to kill Mariko for taking what he saw as his and gain his father's admiration.