Yahiko is an orphaned son of a samurai family. Originally a pickpocket he is taken in by Kaoru and to become her pupil in the kamiya kasshin style. Yahiko also studies Kenshin's techniques and leans learns parts of his hiten mitsurugi, and receives Kenshin's reverse blade sword.
When Sony attempted to bring over Rurouni Kenshin to the united states under the title "Samurai X" Yahiko was voiced by Brianne Siddall. In this dub his first named was changed to "Yoshi"
After Medbialasters picked up the license for Rurouni Kenshin. They hired bang zoom! for their own dub of the series which went on to air on Cartoon Network in the United States. In this dub Yahiko is voiced by Wendee Lee
Derek Wade takes over as Yahiko in the Motion picture movie and Reflection OVAs liscensed by ADV. Interestingly enough he voices the character as a child and an adult.