A crossover with Jujutsu Kaisen could also be fascinating. Devilman could interact with the Jujutsu sorcerers. They could learn from each other's powers and techniques. For example, Devilman might teach them about his demon - fighting experience while they could show him how to use cursed energy more effectively.
Another plot could involve a crossover with Attack on Titan. Devilman could find himself in the world of Titans and use his powers to help the Survey Corps. He might have to face off against Titans that are somehow possessed by demons, creating a new level of danger.
One idea could be a crossover with Neon Genesis Evangelion. Devilman and the Eva pilots could team up to fight a common enemy that threatens both their worlds. Maybe a new type of demon that has the ability to control Angels.
Another plot idea is to crossover with Neon Genesis Evangelion. The Angels in Evangelion could be some sort of new form of demons in the Devilman Crybaby universe. The Eva pilots might have to team up with Devilmen to fight these powerful threats. It could explore the psychological aspects of both universes as the characters deal with the new and terrifying situation.
One idea could be an OC who is a half - devil, half - angel. This OC could struggle with their dual nature, trying to find a balance between the chaotic and violent tendencies of the devil side and the peaceful, harmonious nature of the angel side. They might get caught in the middle of the war between devils and humans in the Devilman Crybaby universe.
One idea could be that Devilman and Devil Lady team up to fight a common enemy that is threatening both their worlds. Maybe a powerful demon from another dimension is trying to take over, and they have to combine their powers to stop it.
One popular theme is the exploration of the complex relationships between the characters. For example, the relationship between Akira and Ryo is often delved into more deeply in fanfiction. Another theme could be the alternate versions of the story's events, like what if certain battles had different outcomes. Also, the inner turmoil of the characters, such as Devilman's struggle with his dual nature, is a common theme in fanfiction.
One idea could be Dante from Devil May Cry being summoned to the world of Devilman by Akira. Akira could seek Dante's help to fight against a new type of devil that is beyond his capabilities. Dante, with his arsenal of weapons and devil - slaying skills, would then team up with Akira in his devilman form to take on this new threat.
One idea could be a Devilman crossover with Neon Genesis Evangelion. The Angels could be a new threat to the Devilmen, and the pilots might have to team up with Akira. Another idea is a crossover with Berserk. Guts' struggle against demons could be intertwined with Devilman's world, and they could fight together against a common evil.
In a crossover with My Hero Academia, characters like All Might could be included. His sense of justice would make him an interesting counterpart to Devilman. He could be initially skeptical of Devilman's powers but then come to respect him as they fight together against a villain that combines the traits of demons and quirks.
In this fanfiction, perhaps it delves into the emotional connection between Akira and Miki. Akira's transformation into Devilman could add a lot of drama to their relationship. Miki might be the one who tries to understand Akira's new self, and they could go through a journey of self - discovery together.
One challenge is integrating the different power systems. Naruto has chakra - based powers like ninjutsu and genjutsu, while Devilman Crybaby has demonic powers. It's hard to make them work together in a believable way.
Akira is definitely one of the most interesting. His transformation into Devilman and his internal struggle make for great writing material. Ryo is also fascinating as his true nature and his actions throughout the story give a lot to explore. And Miki, with her kindness in the midst of all the chaos, can be really interesting to write about in different scenarios, like how she copes with the truth about Akira.