Raziel will definitely be on board to provide assistance and mocking to young vampires of under a thousand years old. He won't be much help to breathing folks, except that he can sit watch day and night without needing to sleep.

I haven't decided about Scott and Remus. Both of them would be incredibly helpful, Remus for his magic and Scott because he knows so much about survival and ships that this plot could have been custom made for him. And I'm not sure if that would be good or not.