Rule 34 Dev - 1girl 2020s 2023 2d 2d_(artwork) anthro anthro_only artist_name black_tank_top black_topwear blue_body blue_skin boots bottomwear breasts cleavage clothed clothed_female clothing crouching digital_media_(artwork) ear_fins eyepatch female_anthro female_only fins fish fish_girl hair head_fins holding_spear holding_weapon marine mekyo_(topotopo_0_0) monster monster_girl non-mammal_breasts off_shoulder ponytail red_boots red_hair red_ponytail sharp_teeth simple_background slit_pupils solo_anthro solo_female spear squatting tank_top teeth twitter twitter_username undertale undertale_(series) undyne video_game_character video_games weapon yellow_sclera|1072587