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There are weirder ones out there, so I'll go ahead and toss in this one:

In the Yume Nikki fangame ".flow", there is a collectable Effect called Headphones. There is a picture supplied on the right of the player character, Sabitsuki, wearing said Headphones (bottom of pic). Now, take a look at Toyosatomimi from Ten Desires. Messy white hair, headphones, purple and white dress. What character am I talking about?

Bit of a stretch, I know, but I can't help but wonder if maybe ZUN played .flow before making Ten Desires...

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BONUS CRACKPOT THEORY!: Toyosatomimi is a female representation/re-imagining of a historical male figure. Yume Nikki has many theories revolving around Madotsuki and gender ambiguity. Coincidence?! HAHAHAHAHAAA~ *falls off the world*

I object....there was no puppies mentioned in the theory....therefore it doesnt count
^w^ I like puppies....

she gets it

*point to the ceiling* hey, there's a gullible up there

over there, look *points at the ceiling*

*steal 1 gold from you then run away*

btw i remember i have another coincidence between Touhou and another game but i forget what is it neutral , i'll write it if i remember

*fall down, the bullet cause limpness to the cat*