A savant.
An inventor.
Someone who is skilled in their trade; an artisan.
A trickster.
A member of the military who specializes in manufacturing and repairing weapon systems.
The most important one out of a related group.
The ship occupied by the fleet's commander (usually an admiral); it denotes this by flying his flag.
The ship regarded as most important out of a group, e.g. a nation's navy or company's fleet.
To act as a flagship for.