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Here are some Tewi alt colors I mocked up alongside the Reisen I'd pair them up with.
Tewi appears in one of Reisen's intros in AoCF. Her color does not change depending on what Reisen alt you use. Interestingly enough, Yukari uses Chen and Ran for intros and attacks and those two get different colors depending on what color Yukari is.
Here are everyone else's portraits + sprites. (Yes, I know Rumia bending her arms is very cursed.)
In EoSD, Meiling is the only boss who's in game sprites never match the pose of her portrait. Every other boss has their portrait pose as one of their sprites.
(Remilia is being shown as an example)
Spells require mercury in Touhou. This is why Patchouli is deathly ill. Marisa, on the other hand, has used magic and collected (and spilt) enough poisons to the point where she's developed a resistance that's a borderline immunity to poisonous material.
Patchouli is known as the One Week Girl through the magic she uses. She uses them in the order of a week, however, two days are saved for heavenly bodies. The rest of the days are Chinese elements.
Many locations in Japan are named after daidarabotchi and other names associated with them. It isn't surprising that Cirno would mistake a gigantic prop for one of them, considering the youkai's fame.