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The four fighting games of the Touhou Project are co-developed by doujin circle Twilight Frontier/Tasogare Frontier, who have also developed several fangames for Touhou Project.
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The characters Reimu Hakurei and Yuyuko Saigyouji appear in Square Enix's game LORD of VERMILION Re:2 as guest characters. The flavor text for both the characters' cards was written by ZUN.
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Despite being the main character of the series, Reimu Hakurei does not appear on the icon of any main-series Touhou games for Windows. The main games' icons instead depict Marisa Kirisame. This includes the icon for the spin-off Shoot The Bullet, a game where Marisa isn't playable.
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In October of 2010, Guiness World Records had recognized Touhou Project as the world's most prolific "fan-made shooter series."