[Fixed]-How to not require extended user model fields for a superuser

Instead of using mandatory fields in models, you have to set them to optional using null=True, blank=True and let the validation happen in forms. For users other than admin create a form that checks for extra fields andvalidate those fields. Render this form through templates at the time of signup/registration. Also instead of using modelforms use forms.Form this will give you a better level of customization. This will make extra fields mandatory for all users other than Admin.