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2023 2:3 absurd_res animal_humanoid aquatic aquatic_humanoid blue_body blue_skin butt detailed_background female fin fish fish_humanoid genitals hair head_fin hi_res holding_melee_weapon holding_object holding_polearm holding_spear holding_weapon humanoid kitchen long_hair looking_at_viewer looking_back looking_back_at_viewer mariko_neko melee_weapon nude nude_female nude_humanoid polearm ponytail portrait rear_view red_hair solo spear standing three-quarter_portrait undertale_(series)undyne vulva weapon