If you're doing a crossover with the Final Fantasy series, characters like Cloud Strife would be awesome. His sword - fighting skills and his journey of self - discovery could blend well with the Magi's world. Tifa Lockhart too, with her martial arts and kind heart. In a crossover with the Transformers, Optimus Prime could be a great character to include. The Magi could work with him to protect their world from the Decepticons. And Bumblebee, with his friendly and adventurous nature.
One idea could be a crossover with a popular fantasy world like Middle - earth. Magi from Magi Nation could travel to Middle - earth and interact with the races there, perhaps helping in the fight against Sauron. Another could be a crossover with the Pokemon universe, where Magi use their magic to communicate with Pokemon and go on adventures together. And a third idea is a crossover with the Harry Potter world, with Magi attending Hogwarts and sharing their unique magical abilities with the wizards there.
I'm not sure who the absolute best is, but there are often some talented writers in the fanfiction community. Look for writers who have a lot of positive reviews and comments on their stories. They are likely to be good at crafting engaging Tony and Edyn tales.
There might be a fanfiction where Tony and Edyn team up to save their homeland. They use their unique magical abilities, Tony with his fire - based powers and Edyn with her nature - related magic. Their combined efforts make for an exciting and heartwarming story.
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 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.
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.
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.
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.