Rule 34 Dev - >:( ... 1girl 2010s 2018 2d 2d_(artwork) anthro anthro_only black_and_white breasts delta_rune_(emblem) digital_media_(artwork) ear_fins eyepatch fangs female_anthro female_only fish fish_girl grey_background hair hand_on_hip head_fins japanese_text long_hair marine medium_breasts monster monster_girl non-mammal_breasts one-piece_swimsuit ponytail ribon22 simple_background slit_pupils solo_anthro solo_female spoken_ellipsis swimsuit swimwear text thighs twitter undertale undertale_(series) undyne very_long_hair video_game_character video_games|1034992