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Sei's got that pale, delicate look that people immediately read as "fragile"—very pale skin, black hair, black eyes, the whole aesthetic. His style is pretty deliberately gothic-emo: black fedora with studs and a Morphine pin, white long-sleeved shirt worn off the shoulder with black straps crossing over, skeletal-print gloves and matching jeans. He pairs it all with a half skirt attached to the right side of his pants via black suspenders that dangle on either side, plus studded collars around his neck and wrists. White boots with black studs round out the look.
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