What are some interesting ideas for an 'immortal genos crossover fanfiction'?

How about Alucard from Hellsing? He is an extremely powerful immortal. In a crossover with Genos, Alucard's centuries - old experiences and his complex relationship with humanity could play off well against Genos' more recent creation as a cyborg. They might start off as adversaries, but then find common ground in their fight against a greater evil. Genos could learn a lot about the nature of immortality from Alucard, who has seen so much over the years.

One idea could be to have Aruto cross over with a vampire universe. He could use his unique skills to fight against vampire clans while also trying to understand their immortality. Another could be a crossover with a time - traveling story, where Aruto gets stuck in different time periods and has to use his wits to survive and find his way back, all while dealing with the immortals he meets along the way.

One idea could be a story where Genos accidentally discovers Saitama's secret love for lemon-flavored things and decides to surprise him with a lemon - themed day. He could make lemon pies, lemonade, and decorate their place with lemon - scented items. Another plot could involve a lemon - related challenge where they both have to complete tasks involving lemons to gain some sort of power - up or reward. Maybe a mysterious lemon - themed villain appears and they have to defeat it using their combined strength and the unique properties of lemons.

In 'Immortal Gohan Crossover Fanfiction', a great plot could involve Gohan crossing into the world of Final Fantasy. He could interact with the different races and use his powers to help in their battles against powerful summons. Another idea is that he crosses into the world of 'Avatar: The Last Airbender'. Gohan could learn bending techniques and share his knowledge of ki with Aang and his friends. He could also cross into the world of 'Lord of the Rings' and fight alongside the Fellowship against Sauron's forces.

Well, in 'harry potter immortal crossover fanfiction', there might be a plot where an immortal being tries to change the course of the wizarding war. Since they are immortal, they might have knowledge and resources that could tip the balance. They could also introduce new forms of magic that are more powerful or dangerous. It could also explore how the immortal's view on life and death affects the characters in the Harry Potter world, like making them question the value of their own mortality.

One idea could be that Naruto, with his newfound immortality, somehow ends up in the Twilight universe. He might be mistaken for a new kind of vampire due to his enhanced abilities. Another plot could involve the Twilight characters learning ninja techniques from Naruto. For example, Bella could learn how to better protect herself using Naruto's shadow clone jutsu.

One interesting idea could be a crossover with "Moana". Elsa's ice powers and Moana's connection to the ocean could create a really cool dynamic. Maybe Elsa accidentally freezes part of Moana's ocean and they have to work together to fix it. Another could be with "Tangled". Rapunzel's long hair and her adventurous spirit combined with Elsa and Anna's journey in Frozen 2 would be exciting. Rapunzel could use her hair to help them climb mountains or cross chasms. A third idea is a crossover with "Beauty and the Beast". Belle's love for books and knowledge could help Elsa understand more about her powers and the history of magic in the Frozen world.

One interesting idea could be Ash's eternal journey through different regions. He might encounter new and unique Pokémon that are long extinct in normal timelines. Another idea could be his relationships with other characters over an infinite span of time. For example, how his friendships with Brock and Misty evolve and change in ways that are not possible in the original storyline.

One interesting idea could be Naruto exploring eternal life while still protecting the Hidden Leaf. He might face new challenges as he outlives his friends and has to deal with the loneliness that comes with immortality.

One idea could be a Zyuohger crossover with the Power Rangers. The Zyuohgers could visit the Power Rangers' world and team up to fight a common enemy. They could learn from each other's fighting styles and share their technology.