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.
Archive Binge: It's very tempting to tear through all fifty-plus chapters of Kagerou in a single weekend.
Archive Panic: When the archive page keeps expanding to show the over 45 chapters with 850+ pages, it can definitely get a little intimidating.
Monster(currently being choked by Red's hair): Aren't... you... the Champion?
Red: Sure. What's your point?
Monster: You're... supposed to be... the GOOD guy!
Red: Oh. I'll keep that in mind.
He snaps her neck.
Kano receives one all his own a little later in his mindscape: he snaps out of his Heroic BSOD just in time to stop Red from raping Fuuka, which he accomplishes by beating Red half to death (...again) with a tire iron.
Tonbo, who before then had been a Distressed Damsel, telling Tcaolin exactly where to shove it after getting her speech back:
Genius Bonus: Every twenty-third page of a chapter in Kagerou has "SKIDOO!" at the top of the page, a reference to the phrase "twenty-three skidoo," obsolete slang from early 1900s America. It sort of meant...skedaddle.
It is useful for a reader to know that "5150" (fifty-one-fifty) is a section of the California Welfare and Institutions Code which refers to involuntary psychiatric hold. That is to say, restraining a psychiatric patient without their consent, because that patient is deemed a danger to themselves or others due to their condition.
Nightmare Fuel: Anything that happens in Kano's head qualifies. The horrible tentacle creatures? Hung from the ceiling with pipes through his chest? The Breaking Noise Monster? Yeesh.