Live Performance refers to Nightmare Fuel onstage, whether a real incident (a band member collapsing or becoming ill etcetera) or a staged one (a faked collapse, a Scare Chord that wasn't in a song before).
Meta refers to Nightmare Fuel found in the scene. As any additions to this section will concern real people, please avoid rumourmongering. Only submit incidents/trends that have been proven and are known about by the public. (For example, if there is an interview in which an artist has talked about their drug addiction/anorexia/suicide attempt, fine. Add it. If there is not, and the only evidence that they have a disorder comes from an unnamed source or internet rumourmill, leave it off.)
Many forms of Visual Kei, specifically Visual Shock and Eroguro Kei, tend to rely heavily on stagecraft and effects to produce shocking imagery. This is generally not Nightmare Fuel. Where the nightmare fuel resides is when you realize it's not blood squibs or makeup and that guy cutting himself onstage or otherwise performing self-injury is doing it for real. Kyo of Dir En Grey is particularly notorious for this.
Faked collapses and falls can also have this effect, albeit for a shorter time, because there is that little bit of uncertainty, especially with artists who have suffered serious injuries onstage as well as who like to fake collapses for drama, of is it real this time?
Fan behavior at lives can definitely become Nightmare Fuel. While most fans are intelligent and respectful, there are some that are not. From groping the artists, to ripping out their hair or ripping off a part of their costume (or even something functional like a neck brace) to attacking other fans, it's all happened.
Attacks on fans and other concert-goers might be less common nowadays due to tighter security measures in most venues and some artists explicitly prohibiting moshing or any form of disruptive audience behavior during lives, but that's just mainstream Visual Kei - the underground scene, being more connected with delinquent culture, is just as notable as the brocore/mallcore crowd for attracting Fan Haters, dimwitted thugs and hot-blooded wiggers who would attend live events in order to pick fights with other concert-goers.
Internet abuse/harassment/trolling of artists also gets a small mention here, because while it's not as overtly and obviously dangerous as meatspace fan behavior, it can get very viciously angry or otherwise troubling, and there are plenty of people that post everything from creepy stalker-like posts to engaging in behavior that qualifies as emotional and verbal abuse (e.g. trying to trigger people into breakdowns or eating disorders or relapses, manipulate and threaten them, or spam them with insults) You might not think much of this, but just try to imagine opening your Facebook or Twitter and 20 to 50 percent of the comments (depending on who you are) are some form of abuse, insults, commentary about how you are doing everything wrong and need to break up your band and quit already, triggering comments about lost lovers or friends, comments about you being too fat or too skinny, encouragement to drink more even if everyone knows you have an alcohol problem, or the like.
The GazettE's Taion is about the kidnapping, rape, and murder of Junko Furuta.
X Japan's Art Of Life is actually Fridge HorrorNightmare Fuel: it's Yoshiki's semi-autobiographical personal story of pulling through a horrific depression and its attendant overwhelming emotional pain. It becomes Nightmare Fuel when you read one of the interviews where he mentioned that it refers to an attempted and failed suicide.
Another X Japan one is Without You, especially to those who have been in the situation of either losing a loved one to death or almost doing so. The lyrics aren't necessarily nightmarish per se, but the raw pain of losing someone's love or close friend forever is.
And yet another is Sadistic Desire, both from the lyrics and the Fridge Horror that it is describing a serial killer and rapist attacking victims. It's arguably meant more as BDSM fantasy than as an actual Misogyny Song, but still...
The insanely high rate of alcoholism and alcohol abuse in the Visual Kei scene. Combine Japan's already high levels of alcohol misuse problems with Sex, Drugs and Rock & Roll, and you have what is best described as an alcoholic nightmare. Almost all lives are held at bars and live houses which serve alcohol, many band meetings and networking events are drinking parties, everyone celebrates everything with alcohol. As noted in the main article, alcohol could be argued to be the lifeblood of Visual Kei.
While not as common as alcohol abuse, methamphetamine addiction. The drug convinces users they've reduced the need for sleep and rest (making impossible work schedules seem possible) and helps them maintain a low body fat ratio. It is one of the most physically and mentally destructive and addictive drugs in existence. The "reduction in sleep and rest" and "better looks" are basically drawn out of the bank account of the user's body and mind—eventually users will crash hardcore, and this usually results in a mental breakdown, the loss of physical appearance far faster than normal aging would produce, and many, many more horrific effects.
The amount of body fascism present within the scene. The thinner an artist is, the more aesthetically pleasing he is generally seen to be, and fans will pile onto artists and other fans with incredibly venomous verbal abuse even for being at a normal weight, while some labels will actively refuse to work with artists who don't meet a certain standard for beauty.
Yakuza getting involved, at least in the Japanese scene. For artists outside of Japan, they may not even know or care how yakuza-infested Visual Kei can be, but in Japan itself, as in pretty much anything entertainment or business related there, you will eventually find yourself dealing with yakuza - whether for protection or because they are blackmailing you, or to buy your drugs, or in worse cases, because you are one yourself.
X Japan's White Poem, is this if you find the combination of extreme BDSM (we're talking suspension hooks and blood-drawing whips here) and an acid-trippy ambience around it all nightmarish. The live is a bit toned down... into being an actual BDSM domination scene, which isn't that nightmarish unless the idea of femdom freaks you out—but the PV is, while nowhere near as real, far more nightmarish.
ANY given video by Dir En Grey. Almost all of their videos are not only NSFW, but Mind Screw, Paranoia Fuel, and this trope. Almost the only ones that aren't are live performance, and depending on how razor-happy Kyo gets... some of those are too.