I think of Role Functions as being the natural role of an individual in a group situation. For example, an INFp with role might take the role of observing group dynamics and how people interact each other, which helps him use his and to come up with creative solutions for keeping the group emotionally healthy. An ENTp, on the other hand, has :se: as a role function, resulting in her taking a role in the development of group hierarchy, likely taking a lead role.

This is part of what causes conflict between Quasi-Identities: they have each others' Hidden Agendas as Role functions, so they become subconsciously jealous of each others' role within a group, manifesting itself in an outward expression of perceived disdain, which, although it may seem grounded in some case, is actually motivated by Hidden Agenda "starvation."