I realized that when a manga is a seinen type of series, very few or no pervy doujins are ever made available on the internet.

If anyone could lead me to the right direction on where to find these doujins of Kingdom, I would greatly appreciate it.

If none come to mind, then maybe some H-series that have war/army battles or king/queens or history in them would be great...

Have you tried searching here yet?

http://www.doujinshi.org/browse/parody/4824/Kingdom/

(Most of them look BL though lol. )

Maybe try Pixiv? Though seeing as the series doesn't even have an anime adapation, I doubt there will be much.

Thanks for the info. Never tried that place..lol
And Kingdom does have an anime adaptation (it has 2 seasons I think) that seems to appear more shounen. Which was why i would think there to be allot of H-Doujins being done. But it seems like Kingdom's popularity isn't on the same scale as Naruto or One_Piece...in Japan either.

So maybe I'll have better luck in 2 years time.