1girl, fate/grand_order, fate_(series), lady_avalon_(fate), lady_avalon_(second_ascension)_(fate), long_hair, looking_at_viewer, merlin_(fate/prototype), one-piece_swimsuit, parasol, pink_eyes, poshi00, solo, swimsuit, umbrella, very_long_hair, white_background, white_hair, white_one-piece_swimsuit, white_theme