Leebo
2 points, Rebel only, unique.
Action: perform a free boost action. Then receive 1 ion token.
Cheaper than an Engine Upgrade, but with an extra cost.
Ships currently capable of carrying Leebo:
YT-1300
YT-2400
B-Wing with a cockpit modification
HWK-290
You could put him on a huge ship, but they can't perform free actions so that would be useless.
So, what to do with him, where to place him to his best effect?
On a small base ship, if you trigger him, he takes effect immediately on the next round. In case of Advanced Sensors you still maneuver the round you trigger Leebo, but skip your planning in the next round.
On a large ship you of course need two ion tokens to become ioned so you have some influence on when to trigger it.
The first build is of course on the YT-2400, the ship he comes with and he can actually pilot.