Very Cracked Plotbunny.

A kinda NCIS/Firefly crossover.

Gibbs grumpy ex military captain of the ship who is probably also the pilot cos he doesn't want anyone else driving/flying his boat.
Kate as his quite professional first officer.
Tony as a Companion (don't hit me please?) he likes people he like playing with people this way he gets paid for pretty much being himself.
Abby as a Kaylee like character quirky and techminded.
Ducky would be a Book like character I suppose.
And I'm really not sure where McGee would fit in. Passenger?

*smacks head into desk*