undyne, undertale, alternate version available, simple background, 1girls, 2020s, 2023, anthro, anthro only, artist name, bikini, black bikini, blue body, blue skin, bones on skin (artist), breasts, eye patch, eyepatch, female, female only, fish, fish girl, hand on waist, long hair, looking at viewer, marine, monster, monster girl, non-mammal breasts, ponytail, red hair, sharp teeth, slit pupils, solo, solo anthro, solo female, undertale (series), yellow sclera, yellow teeth,

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