Sasuke died at the hand of his own brother, but because of Hagoromo he wakes up inside of Naruto's mindscape instead of being sent to the afterlife like the rest of his clan.
Now Sasuke must help Naruto to become stronger so he can achieve his own goals and in return Naruto will avenge the Uchiha clan by killing Itachi.
Abilities:
1- Chakra Chains
2- Sensor
3- Sharingan
4- Wind, Fire and Lightning Release
Rules:
1- No characters bashing and cliches like: civilian council, mobs beating Naruto and friendly Kyuubi who calls Naruto "Kit"...
2- Naruto must tell no one about Sasuke, as their is a chance that Itachi will try to kill him.
3- Outside of fights Naruto's personality must be similar to the Canon but more smart and not naive.
4- Naruto's fight style must be different than the Canon's, so no 30 Kage bunshin in every fight.
5- Pairing: if anyone wants a Harem the girls must not be more than 5 and all of them the same age as Naruto.
Optional:
1- Naruto join Orochimaru like Sasuke in Canon, you can make him leave to learn more about the curse seal and how to remove it.
2- Hinata part of Team 7 and became Jiraiya's apprentice.
3- Change Hinata's personality to the one from the RTN Movie.
4- You can decides Why Itachi killed his brother.
If anyone is interested in this idea please send me a message to my PM.