Of ALL images to make me question this I now wonder: do they have 1 or 2 sets of ears?
Also this is really cute and if there's a season 2 I want them to be a unit <3
^Just spam magic over and over, and chug all the consumables you have. That's my strategy for all the bosses, and it pretty much always works.
Also grinding.
And she's the shop lady, you buy potions and stuff from her. Also a playable character in Bloodstained: Curse of the Moon.