I am not totally familiar with everything about Touhou. I only know the basics like the fact it was a shooting game and I know a selective amount of characters.

My favorite Touhou character would be Patchouli Knowledge.

There are lots of wonderful merchandises for Touhou. I really like the Nendoroid Petit figure that had been released so far. There's also the doujinshis. My wallet can't keep up, so I find myself being picky with the quality of the products.