interesting,
just a few suggestions (some already exist through events):
Benelux: Holland, Belgium, Luxemburg
Scandinavia: Norway, Sweden, Finland (perhaps Denmark)
Anglo-American: UK, US
UK, France (perhaps option to add US)
Germany-Italy (and smaller fascist nations in central europe)

Norway sweden Finland denmark= kalmar union

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1346050188
in this mod country which takes another country also takes over all of generals.Add something like that to your mod

You can adapt this code to mod

}
set_cosmetic_tag = GSU_UNIFIED


custom_effect_tooltip = cores_gained

SOV = {
every_unit_leader = {
set_nationality = GER
}
}
annex_country = { target = SOV transfer_troops = yes }

hidden_effect = {
news_event = { hours = 6 id = news.1337 }
}

@kkutaz504 Oh thanks! I was putting off figuring out how to do that for right now (my connection is awful at the moment and I didn't want to download the mod) but I'll go ahead and add that as part of the update I'll be releasing in probably less than an hour-ish

suggestions
Polish American Commonwealth
Polish Russia Federal Union
German Russian Confederation
British Chinese Alliance
Russo American Alliance
Franco Spanish Union
Spanish Portugal Union
Brazil Portugal Union
German Netherlands Reich
Russo-Finnish Federation
German-Argentinian Reich
United People Commonwealth (UK and Soviet)
North American Union (Mexico Canada)
Atlantic Imperial Union (Spain,Portugal and UK)
Carpathian Commonwealth (Hungary Romania)
Polish Hungary Commonwealth
US UK Aliance
Adriatic Union (Yugoslavia Italy)

@kkutaz504
Russia and Finland or Poland would kind of be a bit lackluster because they usually end up with them anyway. Also the Russo-American union is already there. I'll see to some of the other ones though.

maybe a ottomen empire with turkey, grecce, and iraq?

@Khan Charles
1 In this Mod there is Poland and France, so I see no reason for the mod not to include Poland, Russia, Finland and Russia
2 Do you know that you can also use your mod on Millenium Dawn and Kaiserreich? I see here the potential for something interesting,but I do not know why Germany is becoming Islamic and Italy and Russia too,in other countries the mod works normally, so just delete the German files and do them the way you did, for example with Japan or with argentina

Try south African Union (with all of south African United)

@kkutaz504 1 France and Poland were included because they're both the main targets of Germany. Finland/Russia or Poland/Russia would just end up feeling like a a more powerful Soviet Union. Although, if Poland does the annexing it could be interesting.

2 Well, I haven't thought about it, but this mod should be compatible with a lot of mods like MD and Kaiserreich because of the way it's set up. I don't know why this mod would impact Germany, Italy, and Russia going Islamic. Mabe it's a fluke? I'll probably make a Kaiserreich and Millennium Dawn versions of the mod, thanks for the suggestion.

@Bill Nye All of Africa seems a bit OP but sure

@waffle toaster I'm not sure about Turkey and Greece for some reason, but I could do one with Turkey, British and French Arabia, Iraq, and Saudi Arabia.

Uh, Western Slavia or something.

Franco-Japanese-Benelux-Spanish-Yugoslav-Greek-Albanian Union

American-Australian Union, American-Brazillian Republic, American-Mexican Empire, German-America, Swiss-America, America-Israel Union, Irish-American Republic.