Yaya Tokers is not a known character in Uma Musume: Pretty Derby. I could not verify this name in the anime, game, manga, or official character lists. If you meant a different Uma Musume character, I can help identify the correct full name, Japanese name, and role in the series. If this is an original or fan-made character, the name can be treated as written: Yaya Tokers, with the Japanese rendering ヤヤ・トーカーズ.