His character could develop in terms of leadership. Madara has been a leader in the past, albeit in a more controversial way. Naruto could learn from Madara's leadership mistakes and strengths. He might become more strategic in his decision - making, not just relying on his brute strength and positive attitude. Also, the experience of being saved by Madara could make Naruto more cautious in dangerous situations, as he now has a newfound respect for the power that exists beyond his own.
Naruto would likely become more open - minded. Since Madara is from an older generation and has a different perspective, Naruto would learn new ways of thinking. He might also gain more confidence, knowing that someone as powerful as Madara has his back. This could make him bolder in his actions towards achieving peace in the ninja world.
Naruto's development could involve a deeper understanding of the Uchiha clan. With Madara's influence, he could learn about their history, their pain, and their power. This new knowledge might make him more empathetic towards Sasuke and other Uchiha. He may also develop new jutsu or fighting styles inspired by what he learns from Madara, which would make him an even more formidable ninja.