BuddyPress.org

If you are proficient at coding you may be able to figure it out, i couldn’t. the feature is going to be built into the next version of buddypress if you can’t wait and manage to figure it out please let me know cause i’d love to be able to do that as well.

https://buddypress.org/support/topic/how-to-add-a-nobody-option-in-the-profile-privacy-options/