Eiji Kisaragi/Story

Art of Fighting 2
Eiji is a ninja from the feared and respected Kisaragi clan, implied to be a descendant of Zantetsu. Sworn to be the strongest under the heavens, he made it his goal to defeat the one school his clan had not yet surpassed: Kyokugenryu Karate. During the first "King of Fighters" tournament, he lost against Ryo Sakazaki, a man who would later become his rival.

Art of Fighting 3
His former student searches for him and is his rival.

The King of Fighters
Eiji's life in this timeline is exactly the same as his Art of Fighting counterpart up until Art of Fighting 2.

The King of Fighters '95
Eiji was summoned by Billy Kane to enter a team with Iori Yagami and him. Although he seemed surprised to see his teammates for the first time, he agreed since it was a chance to continue his agenda against the Kyokugenryu practitioners. After Rugal's death, he and Billy are betrayed by Iori, whom Billy compares to be as dangerous as Geese.

The King of Fighters XI
Eiji seemingly disappeared for years until his sudden return in the eleventh tournament. Prior to the tournament, it is explained that he was extensively training in the mountains by his new master since his defeat in 1995 by Iori. He meets Kasumi Todoh, a girl who wishes to defeat Ryo. He offers her to join her, as he believes that Ryo's defeat at her hands will call her father towards her. One day, in a cafe, he and Kasumi meet Malin; another fighter who also share the same rage against Kyokugenryu Karate. Thanks to her expertise in espionage, she discovered that Takuma Sakazaki was in the hospital, and was currently unable to train his students for the upcoming KOF tournament. Seeing their chance to defeat the Kyokugenryu students at their low point, they formed the "Anti-Kyokugenryu Team" in order to beat them (as well for Eiji to take revenge against Iori for the harsh injuries that both he and Billy had received from him at the end of the '95 tournament). In their team's ending, Malin, Eiji, and Kasumi has arranged for a fight against the Kyokugenryu practitioners during Ryo and King's date, only for them to accidentally get caught in the wrath of an enraged King (due to Yuri Sakazaki, Takuma, and Robert Garcia's shenanigans' to get the two together as a couple).