My new gal Marie :3 I made her on a base by  Jush! I'm really proud of how she turned out.

She's a doe/gazelle hybrid. When she was mortal, she suck with a boyfriend who was utter garbage. He'd abuse her, cheat on her, and use her.
One day, in a drunken rage, he accused her of cheating (she was nothing less than faithful to that scumbag) and he ended up killing her, cutting her head off with an axe. She soon was reborn as a demon and killed him in revenge, the same way he got her.

In her mortal life, she had the same general appearance with the only difference being that her sclera and horns were white instead of dark grey

After her revenge was complete, she decided to live the rest of her now immortal demon life doing what she wanted the most: to be happy and help those who were unable to help themselves. She doesn't live a violent life, and will only get violent when nothing else can be done in the situation.

Because of the way she died, as a demon, she is capable of detaching her head in a modular was, such as Amelia can here: https://www.furaffinity.net/view/24939887/

Note: In my characters's world, demons are not evil, but rather just immortal beings who are capable of more powerful magic than mortals.