Is there any way to change your starting armor? For example, I started with a Spiral Sallet with Mecha Wings, and a regular Spiral Armor. Can I change these to something else? Or are they stuck like that permanently?
If you're referring to the armor itself, alas, there is currently no way to change your starting proto armor. However...
If you're referring to the accessories, you cannot change those either. You may remove them, but they would be destroyed in the process.