πI recommend the following novels to you: "Naruto: Becoming Stronger from Getting Married","Naruto's Yin-Yang Eyes","Muye: Bind the Wave Gate of Fengshui at the Beginning","I Raise a Tail Beast in Naruto World","Naruto's Strongest Cultivation System","Naruto's Blood Following the Net", and "Naruto's Genius Naruto". They are all light novels and derivative doujinshi novels. The plot is very rich and complicated. They are full and long, very suitable for your requirements. I hope you like my recommendation.π