One possible fanfiction plot could be that Deathstroke kidnaps Robin to use him as bait for Batman. He wants to lure Batman into a trap and finally defeat him. Robin, being the resourceful sidekick, leaves behind small clues for Batman to find him, adding an element of mystery and suspense to the story.
One possible plot could be that Brick has some sort of vendetta against Blossom. Maybe he's been jealous of the Powerpuff Girls' success in protecting Townsville and decides to kidnap Blossom to show his superiority. He might hold her in an abandoned lair and try to force her to give up the secrets of her powers.
One possible outcome in this fanfiction could be that Loki kidnaps Darcy for a very specific reason. Maybe he needs her knowledge of some scientific concept that is relevant in the world he is from or is planning to use in his schemes. For example, if Darcy has been working on some sort of energy research that Loki believes can be harnessed for his own power - enhancing purposes.
Well, first off, Deathstroke is a formidable foe. If he kidnaps Robin, he might try to extract information from him about Batman's weaknesses. Robin, being loyal, would of course resist. It could lead to a physical and mental battle between the two.
To create a believable relationship, start with their fundamental differences. Robin is a hero, and Deathstroke is a villain. They could be initially at odds, constantly trying to outwit each other. But then, introduce some common ground, like a shared enemy or a mutual respect for each other's combat skills. This can slowly build a complex relationship.
Robin could use his intelligence to analyze Deathstroke's lair and find a weakness in its security system. He might notice a pattern in the guards' patrols or a flaw in the locking mechanisms. Then, he could use his acrobatic skills to create a distraction and slip away unnoticed.
Nightwing could also be a likely savior. He was once Robin himself and has a strong bond with the current Robin. He might take it upon himself to rescue Robin, using his own unique fighting style and experience to outwit the Joker. Plus, he has his own network of contacts in Gotham that could help in the search.
Batman, of course. He's Robin's mentor and protector. He has the skills, the resources, and the determination to track down Slade and rescue Robin.
One possible scenario in this fanfiction could be that Loki disguises himself and lures Spiderman into a trap. He then transports him to a different realm where Spiderman is completely out of his element. Spiderman would have to rely on his wits and basic powers to try and escape Loki's clutches.
In one scenario, the Joker might kidnap Robin to taunt Batman. He could hold Robin in a secret, elaborately booby - trapped lair. Robin, being the resourceful sidekick, would try to find ways to escape and leave clues for Batman. The Joker would then play mind games with both Robin and Batman through recorded messages and false leads.
The plot might go like this. Slade kidnaps Robin in a very stealthy way. He takes Robin to an abandoned building. There, he tries to indoctrinate Robin into his way of thinking. He could be telling Robin that Batman is using him and that he can offer Robin more power. However, Robin stays true to his beliefs. Meanwhile, Batman is on a frantic search for Robin, following every lead, and the Bat - family is also on high alert. Robin is constantly looking for an opportunity to turn the tables on Slade and escape.