This is a full list of All Roles added to the wiki. Not all roles are created equally. Some of them are only suited to particular Variants, others are particularly uncommon (often for good reason), and in the case of a few of them nobody is really sure why they're on the wiki to begin with. Thus, the roles have been categorized for your convenience above.
You may also be interested in a List of Role Modifiers that may be applied to these roles.