People seem to believe that the Sage of Six Paths had two and only two children Ashura and Indra but what if there was a another child a bastard one. This child was a result of rape of Kazuma by the So6p she didn't realize she was even pregnant till she was Three months when she told him he brought her away. Making Kuzuma think it was a vacation she was brought to and island surrounded by whirlpools and at the center of the island she was killed by the Sage of Six Paths. After he left the island the blood of Kazuma went to each area of the island she then pledged prayers to who ever or any God/gods to save her baby.
This summoned the Shinigami that seeing the situation he went into his human form even he had a heart. He manage to ask the woman what happened gearing that his close friend that he always suspected envied him has cheated on his wife Tsuki a loyal house wife and a good friend. He was mad but also sorry for the mother and child pair he manage to hasten the growth of the baby and in two hours the baby was born.
The boy with bright purple blue eyes just like the Shinigami that surprised him but when he scanned him he had a mixture of Shin's chakra, Kazuma's and a little bit of the So6p's chakra. Shin the Shinigami was surprised but he accepted the child.
One year later~~
Naruto is a carbon copy of Shin as Shin wore a battle kimono with a talisman around his neck, with grayish Rouge red hair to his calves and a hight pony tall with a big needle going through it. Naruto had bright red hair ,a small pony tail and a kimono . He was know learning minor senjutsu from his Tou san