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.
Not to mention the theme that plays when Ramiel attacks. Comes out of nowhere and frightens the life out of you. Perfect for hunting down a weird killer bug thing.
And then there's the admin verb that lets them play pretty much any music on their computer. BiGGiE, one particular Admin, has a folder specifically for Crowning Music of Awesome, including the opening themes to pretty much any TV show from the 90's and several from the 80's.
Game Breaker: The wooden bat or bokken, plus a knife. Due to the way the game calculates unconsciousness (when your energy value reaches zero), it's very easy to knock someone out with a nonlethal weapon in a straight-out fight, as swinging a weapon around depletes your energy. Then, when they're out cold, knifey-knifey. Fixed in an update that made all wooden weapons break.
The real Game Breaker is when the Shinigami Eyes has the Death Note.
Since Pyrce added Black Girl, there have been two jokes about her hair, Hairwings (based on the first style being ridiculously long pigtails, which is also based on the hairstyle of Celestia from Danganronpa) and Hairspider (based on the second style being six French braids that resemble spider legs)
Narm: Bad roleplayers can often be a good source of this and make the whole round So Bad, It's Good, especially if they are playing Pyrce and give their character a far too silly name for the context.
The entire premise of the game is that you're trapped in a school with a killer; the whole THING is Nightmare Fuel. Special mention goes to any time you're sneaking around, trying to find a weapon to defend yourself with, and suddenly you hear the (very loud) axe hitting a locked door...
Ramiel's music. Damn... Ramiel is sheer unadulterated scary.
Any game mode where you're playing with someone who's a good RPer and good at being scary. Some players have been known to induce literal pants-wetting in others at times.
"Stop Having Fun" Guy - In any server you join, there will be a very small group of these people, unless you have the unfortunate luck of joining a server where every single person is one. If they don't recognize you they will watch everything you do vigilantly, and look for reasons to cast you out of the game immediately. Although, not everyone trying to kick bad players out of a game is one of these, because sometimes it's needed.