Flandre Scarlet and Bismarck could make an interesting pair. Flandre is powerful but somewhat unpredictable in the Touhou world, while Bismarck is a strong and authoritative figure in Azur Lane. Their interactions could be full of surprises, with Bismarck trying to keep Flandre in check and Flandre being both curious and a bit mischievous around Bismarck.
Reimu Hakurei and Enterprise would be a great pairing. Reimu is used to dealing with various troubles in Gensokyo, and Enterprise is a heroic figure in Azur Lane. They could share their experiences in combat and leadership. Reimu might teach Enterprise some of her spiritual techniques, while Enterprise could show Reimu the advanced weaponry and strategies of Azur Lane.
Maybe the Azur Lane ships find themselves in Gensokyo, the world of Touhou. They have to adapt to the strange new environment filled with yokai and magic. The shipgirls could form alliances with the Touhou characters to solve problems that arise from their two different worlds colliding, such as a shortage of resources in Gensokyo due to the sudden arrival of so many outsiders.
Another interesting concept is an Azur Lane crossover with a superhero universe. The shipgirls could interact with superheroes, and perhaps their unique powers could be combined in battles. They could also learn from each other's sense of justice and ways of protecting their respective worlds.
I think Naruto and Yata would be an interesting pairing. Naruto's energetic and positive personality could contrast with Yata's somewhat hot - headed nature. They could learn a lot from each other. Naruto could teach Yata about perseverance, and Yata could show Naruto some of his skateboarding tricks.
In a crossover with 'Naruto', Soma could be paired with Naruto. Naruto's love for ramen could lead to some interesting interactions with Soma's cooking skills. They could have a friendly cooking competition where Naruto tries to use his ninja skills to enhance his cooking speed. Another interesting pairing could be Erina with Sakura. Sakura could learn about high - class cooking from Erina while Erina could be impressed by Sakura's medical knowledge which could be applied to food science in some ways.
Well, in Touhou Project crossover fanfiction, a cool concept is the combination of Touhou with modern-day settings like a big city. Imagine Marisa Kirisame flying her broomstick over skyscrapers. Also, crossovers with other video game worlds are great. For instance, Touhou characters in the world of Super Mario, where they might have to deal with Mario - style obstacles. It's all about mixing the familiar Touhou elements with something new and unexpected.
Another interesting concept is a yandere fanfic set in an alternate universe. In this universe, the yandere trait is more common among the shipgirls. A particular shipgirl falls for a new recruit and her yandere behavior causes chaos within the fleet as she tries to keep the recruit all to herself, going against the fleet's rules and regulations. This could lead to a lot of drama and conflict as the other shipgirls and the commanders try to deal with her.
Akira and Minato would be an interesting pairing. Akira, with his leadership skills as the leader of the Phantom Thieves, and Minato, the protagonist of Persona 3, could share their strategies in combat and dealing with the Metaverse. They both have different experiences with their respective groups, so they could learn a lot from each other.
Fanfics that introduce new adventures for the characters are also interesting. For instance, a story where the Touhou characters have to face a new, unknown threat from a different dimension. This allows for creativity in both the plot and the development of the characters.
The Arbiter and Thor. Thor is a powerful Asgardian with his hammer and lightning powers, while the Arbiter is a skilled warrior from the Halo universe. They could fight side by side against a common enemy. Their different cultures and fighting styles would make for an exciting combination. Maybe Thor could teach the Arbiter about magic, and the Arbiter could show Thor some unique Covenant combat techniques.
First, decide which other universe you want to cross Azur Lane with. This is crucial as it will set the tone and direction of your fanfic. Then, research both the Azur Lane lore and the lore of the other universe. For example, if it's a crossover with a game like Pokémon, learn about the Pokémon types, their habitats, and how they interact with trainers. Next, come up with a basic plot. It could be a simple rescue mission where the shipgirls have to save a group of Pokémon from an evil organization in the Azur Lane world. Start writing short scenes or dialogues to get your ideas flowing, like writing a conversation between a shipgirl and a Pokémon trainer.