A possible plot could be that Alex Rider and Wolf are both captured by an evil organization. They are put in a high - tech prison and have to escape together. Alex uses his intelligence to figure out the prison's security system while Wolf uses his physical abilities to fight off the guards. Along the way, they learn about each other's pasts and form a deep bond of friendship that continues even after they escape.
Maybe in the fanfiction, Wolf is actually an undercover agent sent to protect Alex Rider without his knowledge. As they interact, there are misunderstandings at first. Alex thinks Wolf is a threat, but then they discover a common enemy. Their relationship then develops into a strong alliance as they work together to take down the bad guys, with Wolf teaching Alex some of his more unorthodox combat techniques along the way.
You could write a fanfiction where Alex Rider has to go undercover in a school as a normal student, but he discovers a secret society within the school that is involved in some sort of illegal activity. This would be a different kind of mission for him, as he's used to more international espionage. He would have to use his wits and skills in a more confined and familiar setting.
One idea could be an Alex Rider crossover with James Bond. Alex could be recruited by MI6 to assist Bond on a mission. They would bring their unique skills together, with Alex's youth and agility complementing Bond's experience and suave charm.
One possible plot could be that Alex Rider is on a mission in a forested area and he stumbles upon a wolf. Instead of the wolf being hostile, it seems to have an unusual intelligence. Alex discovers that the wolf is actually a genetically modified creature, part of a secret experiment. They form an unlikely alliance to take down the organization behind the unethical experiments.
One idea could be that Alex Rider is sent on a mission to Hogwarts undercover as a new student. He discovers the wizarding world while also trying to complete his MI6 task, which could be related to some dark wizard who has ties to a Muggle criminal organization. Another plot could be Harry Potter and his friends accidentally stumbling into one of Alex Rider's missions in the Muggle world and having to help him out using magic in a very discreet way. A third idea is that Alex Rider is revealed to have some latent wizarding abilities and he gets recruited by Dumbledore to help in the fight against Voldemort, bringing his unique set of spy skills to the wizarding war.
One idea could be to explore what would happen if Alex Rider had to team up with a former enemy. Maybe they discover they have a common foe and must put aside their differences.
It could be a powerful and shadowy figure from Wolf's past, like an old military commander who has gone rogue. This person might have a vendetta against Wolf for some past betrayal and sees Alex as a way to get to Wolf, using Alex's importance in the spy world as leverage.
Another plot could involve the OC being from a different time or dimension within Jumanji. Alex has to figure out how to get the OC back to their own place while also dealing with the normal chaos of the game. Along the way, they develop a deep friendship that changes both of them and how they view the game world.
Maybe Flynn Rider is on a quest for a rare jewel and it leads him to Arendelle. There, he encounters Elsa. Elsa is initially afraid she might accidentally harm Flynn with her powers. However, Flynn is intrigued by her powers and helps her see that they can be used for more than just isolation. They could team up to protect Arendelle from an approaching threat using Elsa's powers and Flynn's street - smart skills.
One popular 'Alex Rider Wolf' fanfic could be the one where Wolf teams up with Alex for an undercover mission. It has a lot of action scenes and great character development.
One idea could be that Naruto gains the power of a Kamen Rider. He could use the Rider's abilities in his battles in the ninja world. For example, using the Rider's speed to outmaneuver his opponents during a fight against Akatsuki members.