I'm trying to come up with a way to boost the Bandit Lord background for the Sovereign, and having trouble with finding a balanced solution.
My immediate idea was to replace the two starting bandit units with new, upgradeable, versions. One axe unit and one sword and shield unit with two interesting abilities each, besides chainmail proficiency. Having four units with three members each at the start of the game can make for a strong opening game.
However, after trying this out it felt pretty dull. Especially since the bandits you can hire would remain rubbish units, only recruited in an emergency. So perhaps it's better to remove the extra starting units and give the three bandit units (club, bow and captain) a boost instead? Which at least involves making them fully upgradeable. That would give the ability a bit of a treasure hunt feel to it, as you scour the map for bandits to recruit before the AI wipes them out.
I also considered giving the Bandit Lord ability a flat boost in growth, say +1, symbolising a roguish talent to attract even hardened outlaws to join your settlements. That would also benefit the AI, who doesn't seem to know how to recruit units in battle.
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Another question I have is if it's possible to have a unit turn into another unit as it gains levels? My idea was to have recruitable weak units that grow in size and change appearance as you reach different tiers of experience.