Crossover: Zhu and Ban Summon a Demon

He was once one of the strongest in the ninja world. Together with his friend, he ushered in a new era for the ninja world! He thought peace had arrived and their ideals had come true, but reality turned out to be far from what he had imagined. To realize his dream, he broke with his friend and took a different path! Uchiha Madara thought he'd found a kid who was just about good enough to use. He could then peacefully descend into the underworld and wait to be resurrected to carry out the Eye of the Moon Plan. But he never expected to end up in a world even more dangerous than the ninja world: the demon realm! After living in the demon realm for more than a thousand years as a demon, Uchiha Madara is suddenly tossed back into the ninja world on a whim by the Demon King. His powers are sealed, he's turned into a kid, and he's given a mission to raise demons' profile in the ninja world. What the heck! P.S. Switching between several accounts was such a hassle, so I've moved this story here. This is part of the Boundless Ideas series, so read at your own risk! Also, updates are irregular! P.P.S. Writing isn't easy. If this isn't for you, please leave quietly. Reasonable suggestions are welcome, but malicious criticism isn't. P.P.P.S. This is pure parody, so the characters are wildly out of character. Please think carefully before reading. Theme: An unusual encounter might lead to a better future and change one's fate