Also known as the "Shrine Maiden of Paradise", Reimu is the shrine maiden of Hakurei Shrine, a remote building set on the overlap between Gensokyo and the human world. She is naturally talented, but because she hates training and is somewhat lazy, her skills are only on average level. However, she has a strong sense of duty towards Gensokyo, and can therefore overcome any obstacle through sheer perseverance.
Cute cosplayer from MoeHaku 2010! I get the feeling I should check out Touhou Project, with all the cosplays its been getting lately. Thanks to Marisa for emailing this!