Hussite Mercs for Bohemia? most of the soldiers after hussite wars became mercs since they fought their whole life so why stop now?, they could take 10% less shock damage and be cheaper to recruit by few %
edit: those hussites should be able to be hired by anyone, they fought for anyone with money later on

Maybe make then playable

Maybe Lisowczycy?

I just had a very deep thaught. What if you could make a naval mercs ? I think it would be a very cool adition to this, i dont know if you already thaught about it or if its even possible, but it could be very cool to see like Venetian and genoese fleets, Barbary pirates, Hanseatic Fleet, and many others and they could also have their bonuses for example pirate fleets for Privatering, and even for your Trade Companies for example "British South African Company Fleet" that would have bonus on Trade Protection and Trade power or "British Indian Company fleet", you can make your imagination run wild. I dont even know if this is gona read anybody but i hope you will, i think this would be really cool :)

That would be a nice idea, unfortunately, EU4 does not allow for naval mercs

Originally posted by Zachary Taylor:

Maybe Lisowczycy?

yeah, company of elears would be great, if you could add them bonus for looting and movement speed or something like that

https://en.wikipedia.org/wiki/Lisowczycy

Could you maybe make so that insted of having companys getting bigger over time. Have them be the same size max maybe 10 k per company but have a lott more of them. This way they will be more flexibel. It would allso be more historical. Nations heired many smaler mearcenary companys for wars and not just one big one.

Can you make it so that merc companies don't count against force limit, and more importantly, make the AI aware of that and make use of it?

I can make an event fire that gives back the FL used whenever a merc company is recruited , but the AI probably won't take advantage of that, since the FL is received after the merc is hired. If the AI is at/near FL, it'll never recruit the merc in the first place.

Maybe make so that cav only mercs have 100% cav to infantry ratio