Who could be the main antagonist in a Va11halla Reader x Jill fanfic?

One idea could be that the reader, who is a regular at Va11halla, discovers Jill's hidden talent for painting. They bond over this new discovery and start collaborating on art projects related to the bar's atmosphere. Another plot could involve the reader helping Jill through a tough time at work when there are some difficult customers at Va11halla. This could strengthen their relationship as they rely on each other for support.

It could be Orochimaru. He's always been interested in unique powers and abilities. The idea of X - 23's mutant abilities and Naruto's jinchuriki powers would be very appealing to him. He might try to capture them both to use in his experiments to gain ultimate power.

Maybe a disgruntled former employee or someone who has a grudge against one of the NCT members. This person could use hacking as a way to get revenge. They might have some knowledge of the NCT's internal workings and use that to their advantage while trying to cause chaos.

A powerful and greedy trainer could be the main antagonist. This trainer wants to capture Servine and Charmeleon not for the love of Pokémon but to sell them for a high price in the black market. He constantly chases them, setting up traps and using other Pokémon to try and weaken them. This creates a lot of tension in the story as Servine and Charmeleon have to constantly be on the run and find ways to outwit the trainer.

Madara Uchiha could be a great antagonist. He could have somehow gained the power to cross into the Bleach universe and is causing trouble there. Yoruichi and Naruto would have to put aside their differences and combine their skills to stop him. Madara's powerful jutsu and his desire for power would make him a formidable foe for the duo.

It could be an evil ninja who has somehow gained access to the technology from Neo's world and wants to use it to take over the Naruto world. He might be able to create clones using digital technology, making him a very difficult enemy to defeat.

It could be a jealous rival. For example, someone who is envious of the growing relationship between Cynthia and May. This person might try to spread false rumors or create misunderstandings to drive them apart.

It could be another powerful Pokemon trainer who wants to use Ghetsis and N's relationship for their own gain. Maybe they try to manipulate them into fighting each other so they can take over their influence in the Pokemon world.

A new character could be created specifically for this fanfic. A mad scientist who is obsessed with cross - species experiments. He sees Rachnera as a perfect specimen and wants to use her to create an army of hybrid creatures. He would target both Rachnera and Spiderman as they try to stop his evil plans.

It could be a powerful superhero who is determined to stop Boxman and Venomous. Maybe a hero from another dimension who has heard of their evil deeds and comes to put an end to their plans.