Aesil was a goddess. And I could totally justify her shark teeth thing, because she needs to toggle between shark teeth and human teeth by 'ejecting' her human teeth and regrowing her shark ones.

Ah, I still remember when I had her main a mermaid-Grimm and then keep it alive, just because she was worried that the Grimm flesh in her tummy would go dissipate if she killed it. Such a best girl.