Who will be my teammates

[Nblade]

No you can't use any active ability and obviously missile skill is useless.

Actually it's an easy choice if you buy the firmware upgrades at the maintenance stations since those bonuses take effect only if no char is assigned as pilot and the mk3 versions are usually provide better or equivalent bonuses then even a maxed out character. What it's good for is changing your bonuses. say your MS gets heavily damaged than you could change from your flight spec firmware to a system spec pilot to boost your shield/armor regen or switch to a gunner if your having trouble hitting your enemies.

Oh and Tennie survived my first play through on alex path.