FeartoFallingApart
you know it's refreshing an mc who has reincarnated and doesn't get silly about being an adult in a child's body because following the same theory as reincarnation has everyone would be adults in a child's body but they don't remember type it's very rare an mc who really lives a new life and leaves the concepts and prejudices behind
You can make 100 sealing technique as an incomplete slug sage technique and Hashirama's Sage mode as a complete sage mode or a mutated one. You can also make MC as an permanent sage mode user as he can absorb solar energy. Also you can use ranking of chakra level after Kage, Peak Kage, Super Kage(Kisame equal to a 1 or 2 tail, Hashirama 4 time Kisame) or Tail Beasts ( 1 Tail = 1, 2 Tails = 2, 3 Tails = 4) Six Path Sage or Kaguya ( After becoming 10 tails Jinchƫriki).