Meta values inheritance

I have to distinguish the members according to their role, i thought that student_meta fields be my case, and works! But users have to fill in the ‘your data’ form first. Is there some way to auto compile the meta_field ‘Role’, inheriting this information from wordpress database without any user action?
I gave a look in enrolments.php and database.php but still don’t have success.
Thanks, Davide