We've introduced a new feature into the beta wardrobe called skins today! Basically, if you have a zombie or morostide zapper base, you can claim them in the beta wardrobe and use them any time!
That means you can have a human avatar, and switch back to being a zombie to pop into the zombie den, you can absolutely do that.
We will be able to add skins as prizes to achievements and events in the future, so keep a look out for fun new ways to change your avatar!
I think this is a really cool thing but am also still torn. As a 2009 boobitis zombie, I've gotten used to "being stuck" with my skin, and can easily cover it up when I want too. I probably equally hide it and show it off. It just feels wrong to simply convert it to a layer that I can use whenever I want. But thanks for making it an option!