@Archmage MC @Kronshi
If it would be alright for me to put my two cents in, a good starting point for both the Homeworld and rebellion gems could be the emerging newborn gems. You have these two rival sides that have been grinding against each other for years until, boom, suddenly there's this burst of recruits and resources that are easily impressionable and obtainable. It would be interesting to see the interactions that come out of both homeworld and rebellion gems playing tug of war with the newborns, especially when used as an initial plot-device.
If it would be alright for me to put my two cents in, a good starting point for both the Homeworld and rebellion gems could be the emerging newborn gems. You have these two rival sides that have been grinding against each other for years until, boom, suddenly there's this burst of recruits and resources that are easily impressionable and obtainable. It would be interesting to see the interactions that come out of both homeworld and rebellion gems playing tug of war with the newborns, especially when used as an initial plot-device.


. Though I have not watched the entirety of Naruto, I am refreshed with most of the things you mentioned (Bijuu, Chakra, Clans, the works). Nevertheless, I won't be super helpful lore-wise, but I would still love to think up some of the specifics concerning the crusaders' chakra as well as the newly 'enslaved' ninjas'. Also, elemental dragons and Bijuu would be great to play around with, especially when fleshing out who the leaders of the nine divisions are.