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Official Site: Viz Media

, known as Yahiko Myojin in the Media Blasters English-language dub and Yoshi Myojin in the English Sony Samurai X dub, is a fictional character from the Rurouni Kenshin manga and anime series authored by Nobuhiro Watsuki. The character of Yahiko is based on the author's childhood experiences practicing kendo; since Watsuki's experienced frustration during kendo classes, the author wrote Yahiko as experiencing frustration with his kendo skills. Watsuki liked Yahiko, and while writing the manga, he began to develop the character so that readers would enjoy him.

The fictional setting takes place during the pre-Meiji period of Japan. Yahiko is an orphan from a samurai family who was forced to work as a thief to repay the debt he had presumably owed, as his parents died before they could repay it. When he is rescued by the main character of the story Himura Kenshin, he decides that he will grow up to be just like Kenshin. But because of his strong beliefs, Kenshin is no longer teaching the sword style he had learned. Therefore, Kenshin arranges for Yahiko to be trained by Kamiya Kaoru, the teacher of the . As the series progresses, Yahiko becomes skilled at swordsmanship and faces many opponents.

Yahiko appears in the featured movie of the series, as well as other media relating to the franchise, including a plethora of electronic games and an original video animation (OVAs) series. His character has been very popular with readers from Rurouni Kenshin, ranking near the top of the series' popularity polls. His character is featured in various types of merchandising developed for the series, such as figurines and key-chains. Several publications have commented on his character. While he was initially criticized for his lack of action in the plot, his further development in the series has been praised.

During the last story arc from the manga, the story takes a darker tone than those from other shōnen series published by Shueisha. As the series was aimed at teenagers, Watsuki made Yahiko the main character during the time when Kenshin thought that Kamiya Kaoru was dead; his role was to serve as the identifying character for readers. However, the author found this hard to do, as the more time Kenshin was unwilling to continue to live, the worse Yahiko felt, leaving Watsuki a more negative feeling concerning the story. By the end of the series as Yahiko becomes a teenager, Watsuki had redesigned his appearance. He wanted Yahiko to impress manga readers so that he could be a protagonist for a possible series sequel. He said this goal influenced his design of Yahiko Kenshin's physical appearance as well as Sanosuke's personality. He added Sanosuke's kanji of to the back of his clothes, and was pleased that various readers recognized it. Although he suggested he was not going to make a sequel, he said the main characters would be Yahiko, Sanjō Tsubame and Tsukayama Yutarō. Watsuki thought about writing a story in which Yahiko and Tsubame would have a son, Myōjin Shinya, who would become a skilled swordsman.

Myoujin Yahiko has not been a contender in any CBUB matches.