Rule 34 Dev - 1girl 2020s 2023 2d 2d_(artwork) abs anthro anthro_only armor armored_boots armored_gloves artist_name bikini bikini_armor black_bikini black_bikini_bottom black_bikini_top blue_body blue_skin breasts cleavage clothed clothed_female clothing delta_rune_(emblem) digital_media_(artwork) ear_fins eyepatch female_anthro female_only fins fish fish_girl gauntlets hair head_fins holding_shield holding_spear holding_weapon marine mekyo_(topotopo_0_0) monster monster_girl muscle muscular_anthro muscular_female navel non-mammal_breasts non-mammal_navel pauldrons ponytail red_hair red_ponytail revealing_clothes shield simple_background skimpy skimpy_outfit slit_pupils solo_anthro solo_female spear teeth twitter twitter_username undertale undertale_(series) undyne video_game_character video_games weapon white_background yellow_sclera|1072310