Heatherhorns

Heatherhorns is a multifaceted individual. These are all one character, and they're all named Heather.

Kinda.
When she starts feeling a certain way, Heatherhorns manifests as a different version of herself - personality and body. For example, If you start rousing her chaotic side, you get Heatherbold. If she's feeling docile and pleasant, she becomes Heatherdoe. Heatherdoe is the most common and consistent form, leaving her the closest thing to a "default" Heather. This means she's the one most often forced to clean up after the others.

The only form that has anything resembling a grip on her ability to shapeshift is LLampaca. The rest just kind of don't know how or when they'll change. They usually hope Heatherbold isn't next, though. Eating mailboxes is not good for your stomach.

Oh right - Heatherhorns was a human until recent years. She has no idea why she changed or how to turn back. Most of her forms are feeling like they should be panicking and trying to find a way to fix this, but deep (or not so deep) down, none of them actually want to change. A genuine desire is all she needs to go back. Heatherhorns is also proof that I really like typing my name.