Add like Greater Serbia or Serbian Empire. I know Kaiserreich has Upgraded Balkans add-on, but it could cool if both of those ideas were in default HoI IV. Also add like something that Serbs declare them Illyrian descent (if you heard of Dr. Miroljub Petrovic you know what am i talking about). You Could also add Greater Croatia focus (maybe you did and i havent noticed). You should add Chetnik Commanders for Serbia like Pavle Djurisic, Momcilo Djujic, Nikola Kalabic etc. Models for both nations armies maybe. Adding Serbian Empire flag along form the empire focus would be good. Add tito and partisans on both nations focuses (cuz tito would like to unite yugoslavia in any way possible). Could give or modify focus of albania (dunno could be good). Thats all of i could think of right now, would tell you more when i think about it.

Really Great Mod btw

You could make your own portraits for Peter ll, Prince Paul, Milan Grol etc.

It might be better to rename the Razgrad state as the city itself isn't that big and the VP is actually located in the Burgas state. Maybe replaced with Stara Zagora or Veliko Turnovo?

I thought of adding more generals for Serbia. Peter II can become a general via an event. The Serbian Empire will be added as a decision in the new update

Thanks a lot for Serbian Empire dude.

There's a bug that lets the game crash when I try to paradrop as Serbia. I however would find Serbian paratroopers a good addition.

Fix OP AI plz. I defeated OP Serbia because they left their capital undefended and never attacked.

Sorry, we can't fix the AI