These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Yume 2kki
Ensemble Darkhorse: There's so many memorable characters it's hard to list them all. Many of them get wallpapers depicting them as well.
Urotsuki herself counts, in fact she's depicted hanging out with Madotsuki the most out of any fan game character period
Goddamn Bats: About 6 different ones, the worst being the snake women, who also like to steal your hard-earned money.
Good Bad Bug: Locations that restrict the use of the Bike do not restrict Wolf+Bike..
Memetic Mutation: One of the effects/characters, the Marginal Vivid Worker, added in version .095, has become a meme on Pixiv.
A boarded-up doorway which you can chainsaw through. You find yourself in a puke-green hallway with black stains all over the walls. At the end of the hallway? A giant Uboa-lookalike that sits on a bed and laughs creepily at you. Gah! Here's a video. And then (in some versions) there's what happens when you use the Telephone effect.
The room with a large, monochrome image of a boy staring at you from water (seen in this video at around 3:30) is somewhat unsettling. It also sometimes morphs into a red version with multiple eyes and a smile.
The Woobie: Aoshiru. He's a lonely kid that's the only occupant in a hospital surrounded by disturbing creatures. And when Urotsuki interacts with him, she kills him automatically.