In such fanfiction, Sakura might be depicted as more alluring and perhaps more bold in her interactions with Madara. Madara could be shown as having a certain charm that draws Sakura to him.
They would likely have a complex relationship. At first, they might be wary of Madara as he has been their enemy in the past. But as they train under him, they would start to respect his skills and knowledge. Naruto might try to understand Madara's motives and see if there's any good in him. Sasuke, having an Uchiha connection, might feel a stronger sense of kinship but still be cautious. Madara, for his part, would probably see them as tools at first but gradually develop a strange sort of respect for their growth.
They could go on adventures to discover ancient ninja secrets. Since they are the same age, they might team up to explore hidden places that are said to hold great power or knowledge. Maybe they would search for lost jutsu together and face various challenges along the way.
Often, Naruto might be paired with Madara in some sense. Their opposing views on power and peace could create interesting interactions in the fanfiction.
Sasuke could be a main character as well. Given his own experiences of being an outcast and having a thirst for power at times, he could relate to Madara in some ways. They might form an unexpected alliance or have a rivalry based on their shared experiences of feeling neglected or misunderstood in the ninja world.
One great Madara Uchiha fanfic could be 'The Redemption of Madara'. In this fanfic, it might explore Madara's character in a new light, perhaps showing his journey towards redemption after all the chaos he caused. Another could be 'Madara's Hidden Love' which could focus on a love interest for Madara that was never explored in the original series, adding a new dimension to his character. And 'Madara: The Mentor' where he takes on a young shinobi as a mentee and teaches them the ways of the Uchiha.
The key events include his battles with Hashirama in their youth. Another is his faking of death. Also, his manipulation of Nagato is important. And of course, his resurrection and fight against the Allied Shinobi Forces.
A good Naruto fanfiction with Madara often has a well - developed plot. For example, if it explores his motives in a new way. In the original, Madara had certain goals like creating the Infinite Tsukuyomi. A fanfiction could expand on why he really wanted that and what else he could have done. Also, a good one gives Madara more depth as a character. Maybe it shows his softer side or his regrets. Good character development for Madara and the other characters around him is key. If it can make the reader understand Madara better, it's a great fanfiction.
One common theme is redemption. Often, the female character tries to redeem Madara from his dark path. Another is the power of love. Many fanfictions show how the female's love can change Madara's actions and beliefs.