Aurora

Aurora is an Oni, created from magic by Anima. While Anima originally planned to continue the elemental idea her mothers innovated, she went a different route. Aurora is pure magic crafted within a crystal. This determined a lot about Aurora's appearance. After this process was completed, Anima was escorted by Valeria to one of the most northern parts of the world, where the connection to an Aetherial powered Aurora shines brightest and connects to the world. In this intense burst of magic, Anima was then able to bring Aurora to life, the Oni forming around the crystal. Her body is pure magic, however shaped to act as typical flesh and bone, and other such things. Naturally because of this, she's immortal.

Anima has the oni differ from the elementals, as Aurora will learn of the world and how it all works from living within it, while the elementals were created with that knowledge. All Aurora knows is about magic that Anima knew at the time, and has a very heightened sense to learn more about magic. But she'll have to learn how to interact with others, only having basic knowledge, just so she doesn't try to strike anyone down with lightning magic over anything minor. But Anima loves the idea of being able to teach her Oni friend, and Aurora is taking fine to such an idea thus far.