Come on, it's got to be Janeway!
The lone starship in the Delta Quadrant yet supplies are never low and shuttlepods are endless. You can be self-serving, self-important and self-indulgent by wasting all your free time away in the holodecks hanging out with fake people instead of other crew members. No matter how dire the situation, someone always knows what polarity to reverse or inverse seconds before the ship explodes to save the day. And even if you die, if Janeway cares enough about you, she can time travel whenever and wherever she wants to in order to correct it.