1. Captain - leads crew, makes main decisions
2. Flight plan specialist - has to understand the Galaxy so they can help the captain navigate issues such as black holes, milky ways, solar rains....
3. Propulsion specialist - manages the propulsion of the ship - not just fuel, but the various mechanisms that propel the ship into space, or let it cruise.... This guy has a huge ego.
4. + 5. You need at least 2 guys who everyone can trust to protect these people. They are called "The Shields". They blend in, but they are like the knights of the Round Table, fiercely loyal, will fight to the death. They also do background checks, do profiling on all ship members and people coming and going. They just hang out with each other and the captain, so there needs to be two. They also manage other lower-level shields. Very high honor job.
6. You need a special scientist - some type of "ologist" who is responsible for researching the particles in the galaxy. Their job is part Abby in NCIS, and part futuristic, because they will be determining if particles, gasses, matter... are known or unknown. If it is unknown, they work feverishly to understand it's compounds and it's negative/positive qualities.
7. This person, has at least one assistant, who helps examine all the matter, gasses, debris, and determines their usefulness. Like maybe something can be food or provide or is a great element for weapons, or it will make your hair shiny...
8. You have to have a translator. Someone who can talk to other intelligent life or try to at least. Does lots of research. Very studious.
9. There has to be someone on the bridge, like a air traffic controller. This person could work with the other scientist to identify information, or look into past time, keep eyes open for things flying around or enemies. Always in disagreement with flight plan specialist.
10. You need a manager on deck. Someone who takes care of all the emails, reports, the log, pictures, makes sure the captain is happy...
11. You need a ship manager who oversees all the things people need (food, laundry, drugs, gifts, cleaning, therapy, education, dating services...)
12, You need a genius, who can do everything and anything, who is a crazy and fun character, who is a hero, but never takes the credit, and has lots of quirks.