I wonder if it would be a good idea to define general ‘roles’ for one-another during the mission. Of course, these would be based on our area of expertise. So we could have a ‘security’ role (i.e. the person responsible for safety and defence) and other roles like botany specialist (for collecting more specimens), engineer (for fixing the monitoring station), navigator (to guide us to where we want to be) etc.
How about these roles:
Technician
Navigator
Xeno biologist (inc. Botany?)
We could have multiples in each. This way it would give our characters more specific jobs to do.