A cool concept would be to combine the magic systems. So, the Soul Reapers' Kidou could be related to Fairy Tail magic in some way. For example, a Soul Reaper could teach some of the Fairy Tail mages how to use Kidou for a special mission against a common enemy that has the ability to disrupt both the Soul Society and the Fairy Tail world.
One interesting plot could be the characters from Fairy Tail and Bleach teaming up to fight a common enemy that threatens both their worlds. For example, a powerful dark mage from Fairy Tail's world teams up with a rogue Hollow from Bleach, and the heroes have to combine their unique powers to stop them. The Fairy Tail mages could use their magic, like Natsu's fire magic, while the Soul Reapers use their Zanpakuto abilities.
But we also can't forget about Ichigo in his final form. He has the power of a Soul King and his combat skills are top - notch. If he were to enter the Fairy Tail world with all his power, he would be able to take on most threats with ease. It really depends on how the crossover is written and what kind of challenges are presented to each character.
One interesting crossover idea could be a battle tournament where characters from both Bleach and Fairy Tail participate. For example, Ichigo from Bleach could face off against Natsu from Fairy Tail. Their different fighting styles, with Ichigo's zanpakuto and Natsu's dragon slayer magic, would make for an exciting showdown. Another idea could be a team - up scenario. Maybe some of the Soul Reapers and Fairy Tail mages have to work together to defeat a common, powerful enemy. This would allow for interactions between characters who have different powers and personalities, like Rukia and Lucy. They could learn from each other's magic systems and grow as characters during the adventure.
The most interesting aspect is seeing the characters interact. For instance, seeing how the stoic characters from Bleach react to the more exuberant ones in Fairy Tail can be really entertaining.
The fire - based abilities of Natsu from Fairy Tail and the ice - based abilities of Hitsugaya from Bleach could create some really cool interactions. Natsu's heat might be able to counteract Hitsugaya's ice in an interesting way, like when they fight together against a powerful foe. Their different combat styles, with Natsu's more brute - force approach and Hitsugaya's more calculated and precise strikes, could also make for an exciting combination.
One idea could be that Ichigo from Bleach somehow ends up in the Fairy Tail world. He could join forces with Natsu and the gang to fight a common enemy. Maybe an Arrancar has escaped to the Fairy Tail universe and is causing chaos, and Ichigo's skills as a Soul Reaper are needed to stop it.
One interesting plot point is the clash of magic systems. In 'bleach and fairy tail crossover fanfiction', you often see how the spiritual powers from Bleach interact with the magic of Fairy Tail. For example, a shinigami's zanpakuto abilities against a Fairy Tail wizard's elemental magic can create some really intense battle scenes.
There's also 'Bleach in the Land of Fiore' which is a great read. In this fanfiction, the Bleach characters find themselves in the Fairy Tail world. The author does a great job of exploring how the different magic systems interact. For example, how would a Quincy's arrows work against Fairy Tail's magic? It makes for a very interesting story.
I really like 'Fairy Tail in the World of Bleach'. In this fanfiction, the Fairy Tail guild members find themselves in the Bleach universe. It's interesting to see how they adapt to the different rules and powers there. They also form new alliances and face common enemies, which makes for a thrilling story.