1girl, ahoge, animal ears, bikini, black hair, breasts, character doll, cleavage, collarbone, ear ornament, hair ornament, halloween, horse ears, horse girl, horse tail, kitasan black (umamusume), kouzuki hajime, looking at viewer, medium breasts, medium hair, navel, open mouth, satono diamond (umamusume), solo, swimsuit, tail, umamusume