the lord of the tower of fate
Naruto was kicked out of konoha (I can't think of any other reason then the cliche "hurt sasuke to much" maybe using idea from "Lion of the West" by Ronin2106) and run to west (or east if you want) and after traveling over the continent he found ruins of the tower of fate (this is some hundreds years after shovel knight game) and after searching them he found red shield (in the ending shield knight come back without her shield) and pick it up to take a look but what he didn't know the enchantress magic was sealed in this and tried to take control over him, but he being stubborn (determined) as he is was able to keep control over himself and absorb this magic and memories into himself changing a little his personality and making him decide to with the help of liquid samurai (as the feel enchantress magic in him) unite this continent under his banner.
In one of my ideas he is giving kyuubi anthropomorfic body and he is joining recreated order of no quarter.
In my second idea he was able to defend his mind from coruption but not body and as this magic was before in control of female body he was transformed into woman.