Who could be the main antagonist in a 'mankae gets arrested' fanfiction?

One possible plot could be that mankae is wrongly accused of a crime. Maybe he was at the wrong place at the wrong time. For example, he was near a store that got robbed and due to some misunderstandings, the police think he was involved. So he gets arrested and has to prove his innocence throughout the fanfiction.

The Joker could be a likely main antagonist. He might be the one who manipulates the situation to get Batman arrested, perhaps by framing him for one of his own heinous crimes. The Joker loves to play mind games, and getting Batman locked up would be a huge part of that.

Well, there might be an old vampire named Victor. Victor has seen many vampires come and go and he takes Mankae under his wing to teach him the ways of the vampire world. Then there's Mia, a witch who has a history with Victor. She senses Mankae's change and offers her help, but she also has her own motives which may or may not be in line with Mankae's survival and well - being.

Maybe an evil artist from another dimension. This artist is jealous of Nathanael's pure creativity and the unique power of his miraculous. They come to Nathanael's world to steal his ideas and use his miraculous for their own dark purposes, like creating chaos and destruction through art.

Maybe the main antagonist is an old enemy of Robin's who becomes jealous of his new powers. This enemy then devises a plan to steal Robin's powers or at least neutralize them so that he can regain his former status as the top threat. He could be a powerful martial artist or a criminal mastermind with a large network of henchmen.

It could be Orochimaru. Since he has always been interested in powerful ninja abilities, he might see Sakura with the Sharingan as a new target. He could try to steal the Sharingan from her to add to his own collection of powerful jutsus and abilities.

A power - hungry politician in Nero's world could be the main antagonist. They see Nero as a threat to their power or as an easy target to gain more influence. They manipulate situations to make it seem like Nero has done something wrong.

Maybe it could be a mad scientist who wants to study the chibi. He sees it as a unique specimen and is willing to do anything to get his hands on it.

It could be a new villain created specifically for the fanfiction. Maybe someone who has a vendetta against Chloe and targets her because she has the Miraculous.

A rogue robotic entity could be the main antagonist. This entity has the ability to roboticize other beings and views Tails as a prime target. It wants to use Tails' body as a vessel to spread its robotic influence further, so it sets out to roboticize him and then use him as a tool for its own dark purposes.