Rule 34 Dev - >:( 1girl 2d 2d_(artwork) anthro anthro_only aruput aruput_ut bikini ear_fins eyepatch feet female_only fins fish fish_girl gills grumpy hair hair_over_one_eye head_fins looking_away monster monster_girl ponytail sharp_teeth sitting soles solo solo_anthro solo_female spear spread_legs swimsuit traditional_media_(artwork) undertale undertale_(series) undyne video_game_character video_games weapon|1027568