Xbooru - 1girl 2d 2d (artwork) anthro anthro only aruput aruput ut bikini blue background blue body blue skin breasts digital media (artwork) ear fins eye patch eyepatch female only fins fish fish girl grumpy hair hair over one eye hand on hip hand on own hip hand on own thigh hand on thigh head fins monster monster girl navel non-mammal breasts non-mammal navel ponytail red hair sharp teeth simple background solid color background solo anthro solo female swimsuit tall tall female undertale undertale (series) undyne video game character video games yellow bikini yellow bikini bottom yellow bikini top