The Spiritual Advisor
The Resident Chaplain is responsible for the spiritual well-being of the crew and serves as a spiritual advisor and confidant to the senior staff. As the state religion of the God-Emperor is mandatory, every ship has one. Fortunately, their task is to tend to the flock of the ship, and so having one does not necessitate awkward social encounters with those who are unfamiliar with the Emperor’s divinity.
Missionaries, on the other hand, seek to spread the word of the Emperor and bring lost sheep back into the fold, and often travel onboard rogue traders.