Kairi

Kairi is a student of the legendary Mizugami style along with his sisters, Hokuto and Nanase, but he is also a user of the legendary style of Muay Thai. He came across a fighter by the name of Akuma and the two had a duel. Kairi was badly scarred, lost his left eye, and was on the verge of death. Akuma was about to finish him off with the Shun Goku Satsu until Kairi retaliated with a burst of pure power that was almost impossible for him to control, the positive version of Akuma's Satsui No Hadou. Since Akuma was still looking for the fighter who could stand against him, he gave an evil smile and said "You will soon be a fighter worthy of a real death match." After the bout, the battle had left Kairi without more than his eye. His own memory had perished as well. Not knowing of his own newfound power as well as his loss of memory, the only thing he knew of was his ability to fight.

Years after his memory loss, he enters a Street Fighter tournament where he reached the finals. He was up against a fighter called Hayate who was Hokuto's lover at the time. Kairi was victorious over the warrior, but gained no memory of who he was. Despite this, he and Akuma have their eventual rematch and in the battle, Kairi gives in to Satsui No Hadou and kills Akuma, leading to Garuda's appearance. Kairi thus becomes "Evil Kairi".

In EX 2, Kairi is turned to the light by the kindness of Nanase's heart. Hokuto, meanwhile, has turned to darkness, so Kairi attempts to return his sister to the light. Although much more stronger, skilled and powerful than Hokuto, Kairi avoids trying to fight her and powers down his last punch which sends both of them back. They were both stated to be alive however by the time EX 3 emerges.