Kairi is one of several original characters appearing in Kingdom Hearts Birth by Sleep, Kingdom Hearts, Kingdom Hearts Chain of Memories and Kingdom Hearts II, and also one of the main characters in the series. She is the original persona of Naminé. Kairi was born in Radiant Garden and currently lives on Destiny Islandsalong with her two best friends, Sora and Riku. She is four during Kingdom Hearts Birth By Sleep, fourteen during Kingdom Hearts, fifteen during Kingdom Hearts II, and sixteen during Kingdom Hearts 3D: Dream Drop Distance. Kairi's name is derived from the Japanese word for "sea" (海 Kai?), though her full name is homophonous with the word for "nautical mile" (海里 Kairi?).