The musician or artist doesn't necessarily like Visual Kei but realizes there is money to be made there. More common in the old days - Visual Kei is most definitely NOT a moneymaking venture in and of itself in most places as of The New Tens. However, VKB 48 was an attempt at this.
The musician or artist is GLBTQIA and noticed opportunities for a not-straight and proud artist in Visual Kei.
The musician or artist isn't necessarily devoted to or interested in Visual Kei but is performing a tribute show for a Visual Kei artist or is doing a photoshoot with Visual Kei artists or in a magazine generally devoted to Visual Kei.
The musician or artist wants to experiment with doing something different.
A Visual Kei band decides to parody a now-dated style of Visual Kei such as Visual Shock or Kote Kei, or another Visual Kei band. This can be Affectionate Parody or snark. This would be much like Jealkb or the Yoshiki and Toshi impersonators that popped up on a TV show once or twice.
A Visual Kei band or artist that is sobad that it becomes Self-Parody. COLOR may have been an early version of this, Maria Cross's videos are almost certainly this.
Zig Zagged: A band that starts out as Visual Kei and/or is widely recognized as such, but that alternates between disavowing the scene / claiming to have no connection to it (as in averted, inverted and double subverted) and marketing to visual kei fans, engageing in events with visual kei artists, supporting the scene, and similar. Examples of such bands would be Buck Tick, Dir En Grey, L Arc En Ciel and Hyde's solo career. Post-Visual Kei bands are highly notorious for this.
A musician or artist is simply not Visual Kei. He or she doesn't hate or bear a grudge against the genre as in inverted, it's just not his or her style or scene.
A Visual Kei fan stays just that - an uninvolved fan. They don't adapt anything of the scene to their lifestyle, their appearance stays very normal, they do not even consider joining in as an artist or a musician, or necessarily even supporting one in any way aside from maybe buying some music or going to a show.
A Visual Kei band, obviously, though some exceptions exist there - generally toward the Legacy Character side. (If a member of a Visual Kei band is vital to it and chooses to drop the style, he may well remain a member depending on how vital his skills or his name is to the band. Pata in X Japan is a good example of this - saying he is currently Visual Kei is stretching the trope to its limit, but he is the surviving original guitarist, his skills can't be replaced, and he is vital to the band, so most fans are more than willing to overlook that he no longer is technically "visual."
Visual Kei labels. Good luck signing to Extasy or Free Will in the late 80s - early 90s or to Under Code, PS Company or Sherow Artist Society in The New Tens if you're not Visual Kei in some way or another.
A venue or show whose dress code is some form of Visual Kei.
Lampshaded: "The last time I saw someone in that much makeup was at a club in Shinjuku."
Reconstructed: All of the above exists, but it isn't to the degree that somesay. Some artists do legitimately make money either via their art or via more acceptable ways than prostituting themselves or organized crime. For varied reasons, the Japanese scene is beginning to decouple from the Yakuza and Visual Kei artists may not even know or care about them one way or the other outside of Japan. A fair percentage of artists do indeed care about art and that is why they've chosen the genre. The worst excesses of Sex, Drugs and Rock & Roll are beginning to ebb, with some artists going sober and others becoming aware of danger, if not sober. Visual Kei has become, for better or less, somewhat self-supporting, and non-Japanese scenes are bringing in new artists, new styles, and more creativity.
Plotted A Good Waste:
An actual Visual Kei artist intentionally constructs a persona that is one that fans will feel a specific, visceral reaction to, or writes lyrics or acts on stage in a way to create said fan reaction.
In a work where a Visual Kei artist is depicted, the character is there as a Shout-Out, because there is quite a lot of drama and intrigue to be explored from his/her life in the scene, or simply to provide someone for the audience to laugh at or be annoyed by.
Jealkb, being a Visual Kei band started to parody other bands.
A Visual Kei artist exists in a work but only as the butt of jokes. He is the Butt Monkey of the entire story, with everyone picking on him for some reason or another. Can easily stray into Unfortunate Implications if the gender presentation is the issue.