Hardy and headstrong, Medaka values her family and homeland very deeply, enough to confront grown men alone and throw herself against dangerous weapons. At the same time, she is aware of her limits as a fighter, and is not above manipulating new 'allies' (such as Luffy and Zoro) into fighting with her.

Due to Ganzack's conquest of her homeland, she held a deep hatred for all pirates, regardless of allegiance. However, Luffy's valor led her to reconsider this, and she came to admire the Straw Hat Pirates for helping defeat the Ganzack Pirates and freeing her homeland.