Thinking about why spinner has his forearms covered (I am ignoring Stain's influence)
(drabble under the cut)
CW: description of scars
The league was on the run and being around each other all the time meant they saw each other outside of their villain personas. Toga wore large sweaters and kept her hair pulled back - in braids, hair ties, pigtails, pinned - it didn't matter so long as it stayed out of her face. It wasn't uncommon to see Twice with his mask off but it never lasted long. Mr. Compress kept his face covered still - in a face mask or bandana and a hat - whatever was convenient. Dabi flitted in and out, hardly staying in one place for long. When he did, it was usually with a smoke and sans jacket. Spinner still seemed on edge and standoffish, with a long sleeved shirt or jacket on - different from his sleeveless Stain inspired shirt. Shigaraki was the same as always. He had no need to don a villain persona and his hands were as close as always.
Tapping away on a hand held game console, a game over screen flashed. Huffing out a breath, movement caught Shigaraki's eye. Glancing up, he saw Spinner pushing up his sleeves. Looking back down at his game, Shigaraki paused. He knew what those were. Shigaraki looked up through his eyelashes. Scars littered Spinner's forearms, crossing over one another in sporadic multitudes. Raised bumps, pale skin, scales missing, divets and uneven gashes. Some of them looked old - pale and barely there - others looked healed, but still stretching skin unevenly and brighter, not quite settled in the skin. Raising his eyes to briefly look at Spinner's relaxed face, Shigaraki put his attention back on his console. He stared at the screen. He measured the time it blinked the game over - flash flash flash. He thought. Dabi's scars had an obvious cause, it wasn't hard to guess how and why they covered so much of his body. A single cause with irritation from improper care and overuse. He himself was intimately familiar with his own. Shigaraki furrowed his eyebrows. He knew what skin biopsies looked like, various weapons and wounds, burns and impalements, and how they healed from his time around Nomus. He knew what old scars looked like, what new ones did, and how they overlapped on the skin. He scratched his neck, the uneven surface causing his nails to catch awkwardly as he pulled across. He glanced back up. Spinner had scars that looked like biopsies, but with rough edges from unsure cuts and ripped chunks from scales that never grew back. Scars that ripped up edges of nearby scales without dislodging them. Patches of skin that Shigaraki supposed lied covered underneath all Spinner's scales. Various ages and depths telling a story, a story that Spinner kept hidden and quiet. Clicking the restart button, Shigaraki narrowed his eyes. One day, he'd get that story from him.