It would be good to have a person's roles appear in their profile under the roles tab.

Currently the roles tab shows the locally assigned roles and override roles rather than the roles they may have at a system, frontpage, category, subcategory, course or activity level.

This info may be hard to show on the profile tab with all of the possible role levels  and not forgetting the possibility of having more than one role.

A report sounds like a good option to easily show a person's roles as it is hard to track down problems with roles.