
What if Roku killed Sozin here?
Who would become Firelord?
I suppose Zeisan could take the throne with Roku's support but she's be pretty unpopular amongst the nobility and Fire Nation for being a nonbender woman. Especially since Sozin was fairly popular and already started propaganda against a lot of her ideals.
Then again Sozin might've already taken care of Zeisan by that point so a Fire Nation Civil War could erupt as people try to become Firelord. Would the Fire Nation want vengeance on Roku for killing Sozin or will they just see the Avatar's will as law?