Well, it's quite unique. Usually, fanfictions stick to within their own series' universes or do more common crossovers. But this one seems to be out of the box. It might be less common because the two characters come from very different worlds with distinct magic systems and storylines. However, for the fans who are into creative and wild ideas, this could be really exciting.
This concept is definitely unique. Fanfiction often has a wide range of ideas, but this one stands out. Harry is from a world of wizards, magic spells, and a fight against dark wizards in a somewhat modern - ish setting. Madara, on the other hand, is from a world of ninjas, chakra, and complex clan politics. Combining them in a way that they have a child is a very unorthodox idea. It may attract a niche group of fans who love to think about how different fictional powers and cultures could blend together through such an extreme scenario.
Chapter 649, "Where Did the Wild Wolf Come From?!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, Several people successively lay down in the tent, and before long,....
Chapter 414, "The White Knife Goes In, The Red Knife Comes Out", is the clearest early answer because it turns Let's situation into a concrete plot event. It opens with Third Master really lives up to his reputation; his skills are...
Chapter 442, "Let's Form an Alliance", is the clearest early answer because a shaky connection becomes usable in the plot. The chapter turns that into something concrete by moving from Chang Rong was bewildered, "So, she seems pretty impressive." More...
Chapter 733, "Those People from the Jiang Family Are More Stupid than the Next!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter gives readers a real answer by opening on Okay, Sister, you should go to sleep now.
Chapter 622, "Actually Tie Her Up?!", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Watching the uncommon expression on the man's face, Su Yinwan was...
Chapter 434, "The Identity of the Feng Shui Master Can't Be Hidden Anymore", is the clearest early answer because the hidden truth stops feeling like mere subtext. The chapter turns that into something concrete by moving from He thought Jiang Li was just talking, but to his surprise, there...
Chapter 796, "No Such Person?!", is the clearest early answer because it turns Eve's situation into a concrete plot event. The chapter gives readers a real answer by opening on The lively family reunion night came to an abrupt halt, and the...
Chapter 584, "The Wealthy Young Master Renounces Worldly Life for Love", is the clearest early answer because it turns Seeing Jiang Yan's situation into a concrete plot event. The chapter turns that into something concrete by moving from There wasn't a mirror on the small boat.
Chapter 326, "Jiang Mingyu Stranded in a Foreign Land", is the clearest early answer because it turns South America's situation into a concrete plot event. The chapter turns that into something concrete by moving from And at this moment, on the other end of the Earth.
Chapter 648, "Even Wild Boars Make Way!", is the clearest early answer because it turns Pei Ye's situation into a concrete plot event.