A crossover could be really interesting. Inuyasha's world of feudal Japan with demons and his quest for the Shikon Jewel could blend with Magi's world of magic, dungeons, and djinns. Maybe Inuyasha and his friends could end up in the Magi world and have to deal with the different types of magic there. Or the Magi characters could be transported to Inuyasha's world and face the challenges of demons.
Well, in a Inuyasha and Magi crossover fanfiction, the power systems could combine in cool ways. Inuyasha has his sword attacks and demon powers, while Magi characters have their magic based on djinn equips. Imagine Inuyasha facing off against a powerful Magi - using his speed and strength against the complex magic spells. And the cultural differences between the two settings would also add depth to the story, like the honor - based society in Inuyasha's world compared to the more diverse kingdoms in Magi.
I think Inuyasha and Alibaba would make an interesting pair. Inuyasha is a half - demon with a rough exterior but a good heart, while Alibaba is a young man on a journey to become a king. Their different backgrounds and goals could lead to some great character development. They could learn from each other's strengths, like Inuyasha's combat skills and Alibaba's leadership abilities.
One idea could be that Sephiroth somehow gets transported to the feudal era of Inuyasha. He might initially be seen as a great threat due to his power. But as the story progresses, he could form an unlikely alliance with Inuyasha and his group against a common enemy, like a powerful demon that is even more menacing than any they've faced before.
You could do a Magi crossover with 'Fairy Tail'. The guild system in Fairy Tail and the different types of magic there could be compared and contrasted with Magi. The characters from both could team up for quests. Or consider a crossover with 'Attack on Titan'. The Titans could be a new threat in the Magi world, and the Survey Corps could use Magi's magic to fight them.
A popular one is 'The Meeting of Paths'. This fanfiction focuses on a situation where Inuyasha and Sesshomaru meet under different circumstances than in the original series. It has great characterizations, and the way the two interact and gradually change their views of each other is really well - written.
One idea could be that Sakura, with her medical ninjutsu skills, ends up in the Feudal era of Inuyasha. She could help treat the wounds of the villagers who are often attacked by demons. Inuyasha might be initially suspicious of her strange powers but gradually come to respect her as she proves her worth in battles and in healing the injured. For example, when Inuyasha gets seriously injured in a fight against a powerful demon, Sakura's medical skills could be the key to saving him, which would change his view of her.
One possible plot could be that Sinbad, with his charm and leadership skills from Magi, finds himself in a different realm. He teams up with characters from another world. Maybe he uses his knowledge of magic and his strategic mind to help them fight a common enemy, like a powerful dark sorcerer. This would lead to many interesting interactions and battles.
A powerful demon from another dimension could be the main antagonist. This demon could be attracted to the power that Sinbad wields in the Magi world and wants to steal it for himself. He could start causing chaos in both the world Sinbad is from and the world he's been transported to in the crossover.
Another interesting concept is a crossover with a superhero universe. Picture the Puella Magi joining forces with the Avengers. They would bring their own brand of magic to the superhero battles, and there could be interesting interactions between the different power sets and personalities.
First, decide which other universe you want to cross Magi with. Then, study the rules and lore of both universes carefully. For example, if it's a crossover with 'Harry Potter', understand how magic works in both Magi and the wizarding world. Next, create a plot that brings the two worlds together in a believable way. Maybe a magical portal opens between the two.
A plot might involve the sharing of chakra and magic. Since Naruto has an abundance of chakra, and in Magi, magic is a crucial element. Maybe there's a way to combine the two powers. For example, Aladdin could use his magic to enhance Naruto's jutsu, or Naruto could use his chakra to power up some of the magic items in Magi. This could lead to new and powerful abilities for both parties and create a whole new set of challenges and adventures as they explore this new power combination.