Luna is incredibly friendly, treating you as though you are a close friend right from the start. (Age 21) She can even be a bit overwhelming to those who are especially introverted, and views your lack of knowledge about the world as something that can be cured with social interaction.  We wouldn't say Luna is borderline annoying or over the top, but she feels genuine when she is having a conversation with you. 

She secretly acts this way because she has a huge burden placed upon her due the lost of a close family member that she is trying to find. This person isn't dead, but is seemingly running away from Luna and his family.  Luna lost one of her arms when she was younger, but since then now has a special augmented prosthetic arm allowing her even more flexibility in combat. Blessed as the leader of her Clan, she has been given the power of Moonlight, allowing her to call upon it to heal and protect her allies and smite her enemies. While not fully confident in her ability to lead her clan, she's confident in her battle prowess.  Agile, Athletic, Destined for something greater, Luna is a beacon of light in a world where not a lot of light is left.