A possible plot could be that Voldemort teams up with some powerful villains from the non - wizarding world, and the Ministry of Magic, realizing they need some unorthodox help, recruits the Suicide Squad. The Squad then has to navigate the wizarding world, learn magic (or at least how to defend against it), and fight alongside Harry Potter and his friends against this new super - villain alliance.
An interesting plot could be that a powerful and ancient magical artifact has been stolen and is being used in the non - wizarding world for evil purposes. The Suicide Squad is sent to retrieve it, but they soon discover that it has ties to the wizarding world and Harry Potter and his comrades are also on the hunt for it. This leads to a race between the two groups, with some members gradually realizing they might need to work together to stop the real threat that the artifact poses if misused.
One idea could be exploring the backstories of the lesser - known members in more detail. For example, showing how they got their powers or what led them to their criminal lives.
One way it could work is by having the magical elements of Harry Potter blend with the anti - hero nature of the Suicide Squad. For example, the Suicide Squad could be sent on a mission in the wizarding world. They might have to deal with dark wizards or magical creatures. Their non - magical weapons and skills could be pitted against magic, creating an interesting dynamic.
Well, perhaps the Akatsuki in the Naruto world discovers the existence of the Suicide Squad and decides to recruit them. They see the Squad's unique skills and disregard for conventional morality as useful. However, some members of the Squad, like Harley Quinn, might befriend Naruto instead. This could lead to a split in the Squad, with some siding with the Akatsuki and others joining Naruto to fight against the common enemy.
An OC could be a brilliant but morally ambiguous scientist. In the Suicide Squad fanfiction, this OC could be brought in to develop new weapons or countermeasures against the various threats they face. Their methods might be unethical, but they get results, leading to internal conflict within the Squad about whether to keep them around.
One plot idea could be that the Suicide Squad is sent back in time to prevent a major event that led to the creation of a super - villain they later had to fight. This would give them a chance to change the future for the better. Another idea is that they travel to the future and see the consequences of their actions in the present, and have to find a way to fix things. Or perhaps a member of the Squad accidentally activates a time - travel device and they all end up in different time periods, and have to find each other and get back to their own time.
Well, perhaps Bella is from a different dimension and her knowledge of that dimension's technology or magic can be used by the Suicide Squad. She could be a key to stopping an inter - dimensional threat that the Squad is facing. Also, Bella might have a connection to one of the Squad members from her past, which creates an interesting dynamic within the group.
Well, a plot could be that the Marines in One Piece decide they need some extra help to deal with the pirates, so they make a deal with Amanda Waller to bring in the Suicide Squad. But the Suicide Squad has their own motives and end up causing chaos. For example, Harley Quinn might befriend some of the wackier characters in One Piece like Buggy the Clown, and they start their own little misadventures while the rest of the team tries to figure out how to get back to their own world.
One idea could be Harley Quinn trying to break free from the Joker's control completely within the Suicide Squad setting. Maybe she starts to form real friendships with the other Squad members, like Deadshot, and they help her see that she doesn't need the Joker's madness in her life.
In a 'Deadpool Suicide Squad crossover fanfiction', it could start with Deadpool getting bored with his usual solo adventures. He hears about the Suicide Squad and decides to crash their party. The Squad initially doesn't trust him, but they soon realize his combat skills are useful. They are sent to infiltrate a high - security facility. Deadpool keeps making jokes and irritating the more serious Squad members. However, as they face various challenges and enemies inside the facility, they start to bond in a strange way. Deadpool might even develop a strange friendship with someone like Killer Croc, who is used to being an outcast like him.
Deadpool, without a doubt. His crazy antics, fourth - wall - breaking, and unpredictable nature would add a whole new level of chaos to the already volatile Suicide Squad. He would constantly be making jokes, getting into fights with the other members just for the fun of it, and finding unique ways to solve problems that the more traditional Squad members wouldn't think of.