User blog comment:Mr Easter/Could Kuina be tashigi/@comment-4374114-20131215221247

I'm going to go with the Parent Trap idea, Kuina and Tashigi were sisters but their parents separated long ago. Kuina grew up with her father and learned the art of sword fighting where as Tashigi grew up with their mother and had an uncontrollable interest in swords. They never had any knowledge that either had existed and now Tashigi's mother is dead without mentioning a sister. Tashigi joined the Marines in search of her father and the many swords she has read about. After Zoro achieves his goal and returns to the dojo he will learn of everything after speaking with Koshiro of his many stories on the seas.