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.
I think Killer Croc and Jinbe would have a really unique interaction. Given that they are both sort of 'fish - like' in their own ways. Jinbe might be initially cautious around Killer Croc because of his more menacing appearance, but then they could bond over their shared strength and their experiences in the water - based environments of their respective worlds.
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.
One possible plot is that they are recruited into a secret Suicide Squad - esque team to stop an impending apocalypse. Bill could see it as an opportunity for his own gain, while Dipper is more focused on saving the world. Along the way, they encounter strange creatures and difficult moral choices. Their interactions with the other members of the squad, if there are any, would also add to the complexity of the story.
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.
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 idea could be exploring their relationship before Harley fully embraced her criminal side. Maybe show how the Joker manipulated her in the early days. Another could be a story where they have to face a common enemy in the Suicide Squad universe that forces them to re - evaluate their relationship. Or perhaps a story where Harley starts to break free from the Joker's control and how he reacts to that.
The plot could start with the Suicide Squad being assigned a new mission. There's a new member who seems harmless but is actually the'snake in the grass'. They start to subtly undermine the team's efforts. The 'lemon' could be a strange artifact they are supposed to retrieve. But this new member has their own plans for it. Eventually, the other members of the Squad start to suspect something is wrong and have to figure out how to deal with this traitor before it's too late.
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 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 possible plot could be that the Straw Hat Pirates end up in the Fairy Tail world due to some magical anomaly. They team up with the Fairy Tail guild to fight a common enemy like a powerful dark wizard who has the power to control the seas as well. Luffy and Natsu could have a friendly competition about who is stronger while their respective crews and guild members learn from each other's fighting styles.