yamanaka kotetsu, tiamat (fate), fate/grand order, fate (series), game cg, official art, third-party source, 1girl, absurdly long hair, aqua hair, aqua nails, braid, breasts, breasts apart, crossed bangs, curled horns, dragon girl, dragon tail, expressionless, feet out of frame, fingernails, groin, hair between eyes, hands up, highleg, highleg one-piece swimsuit, horns, hydrokinesis, large breasts, large horns, long hair, long sidelocks, looking at viewer, navel, one-piece swimsuit, parted lips, pink eyes, plunging neckline, pointy ears, purple background, sharp fingernails, sidelocks, solo, strapless, strapless one-piece swimsuit, swimsuit, symbol-shaped pupils, tail, tiamat (swimsuit archer) (third ascension) (fate), very long hair, water, white one-piece swimsuit, x-shaped pupils