Deutsches Wallonie Reich And The Kingdom Of Wallonia In Another World!

Intro:
A 27 year old named Aaros a Master Craftsman and a genius gets reincarnated to another world called Dolkvatte

Upon arriving he noticed that it is still in a 1300s period of technology and economical state, Learning that he can immerse this world in the early technology and economical advances of earth itself (in the 1500-1980) he might just help this world get a better chance of peace.

He is born a Duke's son and has a new name of Sepp Von Gallivare with a caring parents named Degraf Von Gallivare and Kaina de la Gallivare with an older brother named Angelo Von Gallivare he soon shall expect another sibling to be born, therefore he makes it his lifes mission to create a peaceful and calm world for his no everyone who he cares for !

But then a something strange happens he suddenly Comes across a New and Similar Nation from his old world
Its name is ...... Deutsches Wallonie Reich!

But it isn't the same as he knows it the weapons are more advanced and Unknown for him and the regime is the same instead of the Hegemon it is actually just a Peace striving and Trade Rich nation, how will Aaros percieve this?

This story does not have only one MC but it actually has 10. So best of luck to me making these guys backgrounds and fare in this world!