art by doppel, 2boys, arm behind back, armor, ass, bad id, bad pixiv id, black bodysuit, black hair, bodysuit, checkered clothes, checkered neckwear, crossover, danganronpa \(series\), danganronpa v3 killing harmony, hair between eyes, korean text, male focus, multiple boys, nail polish, one-punch man, onsoku no sonic, open mouth, oma kokichi, purple eyes, purple nails, scarf, simple background, smile, straitjacket, two-tone background