I have done some extended research on mythical monsters, here's a few with slight descriptions: Kelpie which is an underwater creature unlike the mermaid that devours others, Sirens which similar to mermaids that lure sailors to unexpected fate, the body of a crow or bird and the head of a man (normally female.)
And here is a few of my own; dark essence(s): those whom reside as an insane conscious and take the forms of humans or other creatures, dream eaters: also taking the form of a human, but a few unnaturalities.
Hope this helped
how about the daughter of domo kun
15 years old
brown skin color
blonde hair with orange and blue highlights
taller than acctual domo kun
and her best friends are Rochelle Goyle,C.A. cupid,Spectra Vondergist,Venus McFlytrap,Rebecca Steam, and more!