1girl absurdres armpits arms_up bad_id bad_pixiv_id bikini bikini_top_only blue_background breasts cleavage collarbone darling_in_the_franxx green_eyes high_ponytail highres horns long_hair navel pink_hair shiny_skin small_breasts solo swimsuit tying_hair umumu upper_body white_bikini zero_two_(darling_in_the_franxx)