[Vikesrock]

Typical roles for a team at competition are:

There may be some overlap between these first three groups depending on team size
Drive Team - 2 drivers, coach (may be a mentor) and human player
Judge Ambassadors - someone should be in your pit at all times to talk to judges
Pit Crew - personnel to work on the robot between matches
Safety Captain - Likely one of the people in the above three groups because this person should be in the pits most of the time

Scouts/strategists - Watch matches and collect data on competing robots

A "runner" would normally be a member of the Drive Team or Pit Crew, this isn't really a frequent enough occurrence at regionals to need a separate person.