Headcanons about Sparkle (Idol! Killer). Character not mine. All rights to this character goes to original creator
-He has tongue, nose, lip, and ear piercings (something like below)
-Used to have a stomach piercing, but didn't like the feel of it
-When on stage, he tends to rarely speak into his mic, unless it's to drop chilling, whispered lines in the middle of a song. He mostly leans into "dead-eyed" fan service, staring directly into the camera with a wide, static grin that would make the audience feel as though they were being hunted
-While he is still "Killer," he secretly obsesses over high-end glitter and body oils that shimmer. He tends to claim it's only to "catch the stage lights better," but he actually likes the texture and shine, finding it satisfyingly distracting
-The black streaks from his eyes aren't just for aesthetic; they're high-maintenance. He tends to spend more time in the makeup chair than the other idols ensuring the "drips" look to be perfectly symmetrical and liquid-black
-He does knife juggling to calm his nerves before a show, instead of vocal warm-ups; he jungles the real, sharpened butterfly knives. The metal clinking helps him to find his rhythm
-He despises the feeling of loose clothing. He prefers his clothing to be "second-skin" tight–PVC, latex, and compression mesh–because it helps him feel "contained"
-He had been trained to walk like a runway model, but he modified it to be a predatory, silent prowl. Even when he's off-stage, he tends to accidentally sneak up on staff members because he makes his footsteps completely silent
-At the fan-signs, he doesn't just sign posters. He draws tiny, glowing neon targets on people's hands or on their phone case.
-If a fan calls him Sparkle instead of calling him Killer, he pretends to hate it–narrowing his eyes, and closely leaning in to intimidate them–but in secret, he keeps a collection of the glittery, cutesy fanart they draw of him
-His "Killergram" tends to be blurry 90% of the time, it's mostly of high-contrast photos of the neon city lights, sharp shadows, and close-ups of his spiked jewelery
-Once in a while, there's a photo of him that leaks holding a very small, very fluffy cat backstage. He never does aknowledge it, and his PR team has to scrub it from the internet to "protect his image"
-His voice doesn't sound deep or booming; it's airy, melodic, and slightly raspy. He actually specializes in both "Whisper-Pop" and "Punk-Rock" where the bass is so heavy it feels like a heartbeat