Sasuke ends up killing Naruto at the end of their fight and become a tyrant that destroyed most of the world to bring peace.
Hagoromo regretting giving Sasuke part of his power decides to change the past with the help of Obito.
Using his power Hagoromo sends Obito's soul to the past to be born as Naruto's twin and becomes Indra's reincarnation instead of Sasuke, the goal is for Obito to help the Child of the Prophecy to fight his past self and save the world.
The only downside of Hagoromo's plan is that by sending Obito's soul to the past he is going to lose most of his memories and only will be able to remember that he must help Naruto be able to see glimpses of the future.
17 years in the past Kushina gives birth to two children, Naruto who becomes the Jinchiruki, and his brother Menma who born with his mother red hair and black eyes.
Like his brother Menma is also ignored by the villagers, but he doesn't care, he only cares about his brother and about protecting the world, and lucky for him unlike Naruto he inherited some of the Uzumaki powers, Chakra Chains and the Mind's Eye of the Kagura, and secretly he has a the Sharingan that only his twin knows about.