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Yamato's name is actually the Japanese phrase for the concept of the "perfect" or "ideal" woman.
Yamato is a hot-blooded female wrestler from the IJWPW, and R. Mika's former tag team partner. She is also the sole daughter of a family that runs a long-established inn.
Her hobbies include tea ceremonies, flower arrangement, and archery.
Nadeshiko was first shown and named in the Capcom Secret File for Street Fighter Alpha 3; she and R. Mika were tag partners prior to R. Mika going solo during the events of the game.
She makes her first appearance in the games in Street Fighter V as part of R. Mika's V-Trigger, Nadeshiko, with Mika calling her to assist in attacks. She also assists Mika in her Peach Assault Critical Art.
Yamato's Street Fighter V profile reveals that she has a secret wrestler persona known as Yasha Nadeshiko (夜叉撫子?), which surfaced soon after R. Mika decided to go solo. She hides her identity by painting her face instead of using a mask, and wears a different midriff-baring costume (though with the same color scheme). As Yasha, she is more prone to trash talk and being more rough in and out of the ring.