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Sioux was a normal girl that went missing in the Forest of the Lost in the Free Cities Alliance. She was found by the Rapu, a species of friendly monsters that resembles fairies. She was raised by them and lived in the village since then. She's very protective towards the village.

Sioux is a very simple and humble girl. She's often enthusiastic and full of energy, always ready to fight or help. She's relied on her skills to survive in the Forest of the Lost. The Rapu raised her and thought her how to talk and fight, but she doesn't know much about the world or human's society. She's very curious about things she doesn't know about.

When someone shows certain proficiency in something she's quickly impressed and praises others. This was seen when Kanami could perform assassinations on various soldiers and Sioux was amazed at her skill, looking up to Kanami and praising her. She also started calling her "Kanami-onee-chan" (which made the ninja happy) and seems to refer that way to every female she looks up. 

From the url=http://alicesoft.wikia.com/wiki/Sioux_ProvinceAliceSoft Wiki