(Touhou 6 to 8) Dark red eyes, black hair, wears large red ribbon in hair, often carries a rod with many paper seals attached in streamers. Wears a red and white dress remotely similar to a shrine maiden's outfit, shoulders are not covered.
(Touhou 1 to 5) Purple eyes, purple hair, wears large red ribbon in hair. Clothes are red and white, and strongly resembles a traditional shrine maiden outfit.
A summary about Reimu goes here.
Reimu has appeared in every single game in the Touhou series.
Reimu was never seen flying with her own power until Embodiment of Scarlet Devil. In the previous games, if Reimu needed to go somewhere far, she would ride on her turtle familiar, Genjii.
Reimu might be eternal...? It's implied by one song from Highly Responsive to Prayers, "Eien no Miko" (永遠の巫女). Either way, with her lively personality there's no sign she'll die anytime soon.
Reimu's yin-yang exhibits some strange powers, aside from helping her attack her enemies. The greatest powers of the Hakurei yin-yang are:
Ability: Mainly able to fly through the sky
As usual, the shrine maiden you all know.
She lives in the Hakurei Shrine located at the boundary that separates Gensokyo from the outer world. The shrine simultaneously exists in both worlds.
She treats everyone fairly and equally, which makes her well-liked by even the most terrifying monsters. On the flip side, she doesn't treat anyone especially well and doesn't hold anyone "special". While she's often seen with a wide assortment of humans and youkai, and does get along with them, she's truly alone in her heart.
She may be kind of cold-hearted...
The morning that she was expecting to see after a full night's sleep did not greet her. She thought that something very strange was going on, so she left the shrine to investigate. It's not unusual for her to go out at night, but going out at midnight just after having taken a full night's rest was most unusual. Anyway, nights always make her sleepy, so she'll be going back to bed once the issue is resolved. She followed a trace of power into a bamboo forest, and what she found were very familiar faces...