Question:
What do all the characters do on the ship?
Answer:
Captain Jonathan Archer -- Well, he's the captain (see how I did that?), but I like to call him Captain Quantum.
Dr. Phlox -- I'll give you three guesses what he does. Riiight, he's the alien doc on a Vulcan Medical Exchange program.
Subcommander T'Pol is the First Officer. You'll note she takes charge when Cpt. Quantum gets a sliver in his leg or something catastrophic like that which renders him unfit for duty.
Lt. Malcolm Reed is in charge of weapons and various gadgets related to reversing polarities, patching up temporal rifts, or just generally blowing things up. Think of him as "Q" -- not de Lancie, Llewellyn. God rest your soul, Desmond.
Ensign Travis Mayweather is the navigator. He tells the ship where to go.
Ensign Hoshi Sato is the Communications Specialist. You got a problem with Mother Tongue? Well, just hustle yourself over to Sato and she'll put you right.
Cmdr. Charlie "Trip" Tucker III is the southern gent down in Engineering. He's like Scotty -- just think Kentucky Mash rather than Scotch Whiskey.