Seikai(OC): The boy who replaced Naruto Uzumaki

In this story, Naruto Uzumaki does not exist. Instead, an 18-year-old young man from a different world takes his place. He ends up being reincarnated into the Naruto universe and magically becomes the child of Minato Namikaze and Kushina Uzumaki. As a result, he gets the entire Naruto Fox sealed inside of him and inherits mostly his mother's genes, making him more Uzumaki. This makes Seikai one of the strongest ninjas to ever live.