So this is Kay on Earth. She usually keeps her tail and horns unless she goes out. She's the Devil's daughter as well. I use Hazbin Hotel's version so she's Charlie's sister, but she dyes her hair. She's 196,600 years old, yes, she's old as fuck.
This is basically the same, but this is how she appears in Hell as well as when she's with Alex or her wife. Her outfit is slightly different, but it keeps the same color scheme. And she's more like a giant blob of black matter or gas when she looks like this.