So I had done a little re-working of mercenaries (specifically Swords Sisters for being a joke) so I just went full bore again. I really don't like how trashy TW made mercs especially considering how expensive they are. IMO mercenaries should be professional troops, not some ragtag militia. (Calradia already has a homeless problem with amount of Looters running around...)
My general thought process here is
because they are an extra tier expensive, they should be able to defeat troops at their tier, but not above their tier, so as to justify their expense. I also wanted them to be visually/functionally distinct (identifiable) as much as possible so they can be easily recognized and serve a purpose in-game.
Sword Sisters
I basically just upped armored them. They are pretty good crossbow troops, but they don't perform well in melee. Veteran Sword Sisters in particular are quite deadly almost being a match for Fian Champions in ranged combat. Gallant Sword Sisters are very good horse archers, can beat most other T5 HA, but not Khan's Guard.
Western Mercs
Again mostly up arming. Spear/Pike is pretty good at dealing with melee cavalry, but is not very good against regular shield infantry. I gave them all shields to differentiate between Vlandian Pikemen. Hired Elite Pikes can do a lot of damage to Elite Cataphracts/Banner Knights, fight is close, but they do end up losing.
For Hired Crossbows I gave them an extra set of bolts so they can fire longer then other crossbows, but at the cost of their shield.
Eastern Mercs
Once again mostly up arming. Elite Macemen are just strong enough to beat Legionaries. Outriders aren't particularly good horse archers, since they lose to other HA at their Tier. But they are pretty competent melee cavalry and can beat other melee cavalry of their own tier.