season 2: (just checked, pilot doesn't count as a season oops) ultimate lord, biggest aristocrat of them all, if garmadon is a baron then the overlord is the king long ago defeated (first spinjutsu master is the leader of french revolution who beated the king) also intresting how the skeletons help the ninjas out once there master is gone (they reached class consciousness, there not the bad guys) also the snakes help, having learned from there mistakes and became libertarian socialist
season 3, technology falls in the hands of the overlord (king) monarchs are more dangerous then ever
season 4, literal bourge fast food store owner wants army of libertarians to take over the world
season 5, ronin is a literal petty bourge, ghost are lead by old guy who cant let things go, what does that remind you off? (conservatives)
season 6, after being kicked off there homeland some ghosts (Zionists) try to invade someone else's land to live there, the ninjas are pro Palestine and beat them
season 7, (honestly i grew up around this time, everything else i watched after this point and even a bit before that was pure out of nostalgia) some guy is obsessed with time, ultra conservative, other guy is a neolib who doesn't care but doesn't want to get confrontational so goes along with it all
season 8, insane religious cult tries to resurrect to go back to "better time's"
season 9, Netflix doesnt have this yet and dont know howto get it, dont know what happens after this point