Post some random, minor headcanons that you have about the characters here!
You know, your thoughts on characters quirks, habits, hobbies, fashion preferences, casual relationships, physical apperance, anything that would be too minor to be normally adressed in canon, and (so far at least) can't really be proved or disproved. I find it quite interesting to know what other people think the characters do in their spare time, or what minor characteristics they might have. I have a soft spot for "slice of life" stories, and these things can be useful in inspiring a plot for such fics, or to at least differentiate/flesh out the characters a bit more.
For instance, some of mine:
Remilia knows how to play a large variety of instruments, form the piano to the violin to the clarinet, and enjoys playing to large audiences;
All tengu have noses that would be considered large by human standards (although, with the exception of the long-nose tengu, they aren't "supernaturally" large);
The crystals on Flandre's wings were gifts from Patchouli;
Reimu is excellent at caligraphy, and greatly enjoys doing it;
Marisa pampers her tsuchinoko (which, surprisingly, is alive and well) like rich ladies pamper their small yapping dogs;
Yukari's house would break the mind of any uninvited guest, and even people she does invite tend to leave her residence with strong headaches;
Yuyuko breeds butterflies (or, rather, she has a cage with the ghosts of at least one specimen of the 300+ butterfly species from Japan);
Seiga sleeps in the buff (:getdown:);
Kagerou lives in a small, western-style house in the Bamboo Forest, far from the human village;
Kaguya is a great poet, and even the rabbits enjoy listening to her poems (although their meaning is lost on them)
Sanae dislikes drinking because she can't hold her liquor at all;
Shinmyoumaru is the greatest swordmaster in Gensokyo in terms of pure skill;
Byakuren's gradient hair is a side-effect of her thousand year stay in Makai;
Those are the ones I have for now!
And, before someone complains about the lack of literal headcannons... here:
Now, post yours too, if you wish! (Either touhou headcanons or actual headcannons. Both are amusing)