I would like to propose a Naruto challenge which Naruto gets the same abilities as Kabuto after he absorbed Orochimaru's dna.
He can't have the snake protruding from his stomach like Kabuto. It doesn't have to be there at all, but if it is I think it would be better either separate from him and made into a character itself, ( Naruto can communicate with it and it has its own name) or it is a tail.
I would prefer it not to be harem, but if it is make it small, 2-3 characters at the most.
You can come up with how he got the ability, ( whether he's Orochimaru's son, Orochi did it to him, or by an accident for just a few examples)
Also the kyuubi didn't have to attack konoha, he is hated or made an outcast because of how he looks, but if he did then you can come up with your own idea for what happened, preferably not sealed in Naruto but your choice.
And finally you have to put in Naruto training in the snake sage arts at some point, but that is up to you.
Anybody is welcome to try it out, I just saw the snake/dragon sage Kabuto and thought is was really bad ass.
-Have fun with it.