How would R2D2 and Gandhi interact in a fanfiction?

Darth Vader would probably have a complex reaction. He might feel a sense of familiarity that he tries to suppress. His first instinct could be to destroy R2D2 as it represents a part of his old self that he has tried to forget. But at the same time, he might be intrigued by what the droid could tell him about his past or the Rebellion.

It could be a story of heroism. R2 - D2 has been involved in many heroic deeds in the Star Wars universe, so it might be telling a story about saving the day during a crucial battle.

The Akumas in D Gray - Man are created by the Millennium Earl. If Akumas were to enter the Black Butler world, they would be a major threat. Their ability to transform and their inhuman strength would be a challenge for the Black Butler characters. On the other hand, Sebastian's demonic powers and his ability to make contracts could potentially be used to manipulate or destroy the Akumas. The D Gray - Man exorcists are trained to fight Akumas specifically, so their skills would be very useful in this new setting. But the Black Butler characters' knowledge of the local environment and their own unique skills, like Mey - Rin's sharpshooting and Bardroy's combat experience, could also contribute to the fight against the Akumas in ways the D Gray - Man exorcists might not expect.

The characters from 'D Gray - Man' are used to dealing with the supernatural in the form of Akuma and the Noah. In a crossover with 'Black Butler', they would initially be confused by the different types of supernatural entities in the 'Black Butler' world. For example, Grell Sutcliff's unique brand of reaper insanity would be quite a shock to them. Meanwhile, the characters from 'Black Butler' would be equally baffled by the Exorcists' powers and the concept of Innocence. However, as they interact more, some might start to admire the skills and abilities of the others. For instance, Sebastian might respect Allen's combat skills, and Allen might be impressed by Sebastian's loyalty to Ciel, despite their different moral standings.

Their relationship could start off as adversarial. Darth Vader sees R2D2 as just another piece of Rebel technology to be destroyed. But as the story progresses, he might start to respect R2D2's tenacity and the fact that it has survived so many battles. For example, if R2D2 helps Vader in some small way, like leading him out of a dangerous situation, Vader might start to view the droid differently.

Naruto would probably be very enthusiastic and friendly towards Arya. He might be constantly trying to get her to open up and share her stories. Arya, on the other hand, would be more guarded initially. For example, Naruto could offer to teach Arya some basic ninja moves like how to climb trees using chakra, and Arya could show Naruto how to use a bow and arrow more effectively.

They might start by comparing powers. Superman's super strength and flight would be quite a topic. Thor would likely want to have a friendly competition with Superman in terms of strength. Then they could move on to sharing their experiences. Captain America could talk about his battles during World War II, and Superman could share his adventures in saving Metropolis. They could also team up to fight a new, powerful villain that neither could defeat alone. For example, a villain with the ability to nullify Superman's powers and hack into the Avengers' technology.

Naruto would probably be very curious about Camila. He'd ask her a lot of questions about her world, like what kind of music she likes or how her society works. Camila, on the other hand, would be in awe of Naruto's ninja abilities. She might ask him to show her some cool jutsu.

The Marauders would likely have a very negative reaction to the Dursleys. Sirius, having run away from his own awful family, would not tolerate the Dursleys' treatment of Harry. He'd probably confront them right away.