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The spokesperson is not part of the interpersonal role.
The figurehead is the one that people should turn to when they are facing a problem or need advice regarding a certain issue.
The leader is supposed to lead his team in all managerial aspects and not just become their manager giving orders, he must also work alongside his team.
The liaison requires a good personality and good communication skills in order for the liaison to be able to interact with a multitude of different people and personalities.