Hakurei_Yume
What's this!? It looks like Reimu, and it kinda smells like Reimu, and it sure as hell ACTS like Reimu, at least in some ways... but that SMILE. That's definitely not Reimu... maybe a bit young for Reimu, too.
And really, it's NOT Reimu. It's a Hakurei, yes, but this is Hakurei Yume! Reimu's daughter, and the current Hakurei maiden, her mother and father having retired, after a fashion. Her Mother wanders Gensokyo, chatting with the locals and helping defuse tensions, and her father is content to often lounge around the shrine and talk to people. Yume's been lucky enough, though, to be born into a period of peace, meaning that she doesn't really NEED to use her powers. Most of her days are spent with her friends, wandering around Gensokyo, or training with the new generation of shrine maidens and monks. It's an easy life... but how long can it last?
Physically, Yume looks like a young Reimu, four feet and nine inches tall with purple eyes and a slender, healthy build. She's almost always clad in the typical Hakurei uniform, though beach excursions warrant other things, and Festival... well, some nights she gets to dress up! Hooray!
What more do you need to know?