ryuuzaki ichi, arknights, artist request, check artist, official art, third-party source, 1boy, black pants, black shirt, blandus (arknights), blue eyes, blue hair, blue sash, facial hair, full body, hand in pocket, holding, lab coat, layered sleeves, long sleeves, mature male, medium hair, octopus boy, pants, pointy ears, sash, shirt, short-sleeved coat, short over long sleeves, short sleeves, shoulder sash, solo, stubble, suction cups, tachi-e, tentacles, transparent background