Saw people doing crossovers of Miku and creepypastas/niche internet things, thought I'd throw my hat into the ring. BFDI is a niche series, and Evil Leafy is the creepiest thing in BFDI(aside from occasionally Four and Yellow Face) so I thought it would be fitting.
Also scrapped "Hatsune Matchku"
Luckily I realized early on that Evil Leafy was a better fit for the trend (though maybe one day I'll do a full Hatsune Matchku and Kasane Pencil)