You can try some popular fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms usually have a large collection of fanfictions, including those related to Alex Rider.
It really depends on your personal taste. Some people like action - packed fanfictions that continue the adventures of Alex Rider in new and exciting ways. For example, those where he goes on a mission to a completely different and dangerous location.
At the start, Alex would be in survival mode. He'd be constantly looking for weaknesses in Yassen's setup to escape. As he spends more time in captivity, he might start to analyze Yassen's actions and words more closely. If Yassen offers him any information about his past or about MI6's secrets, Alex could be both intrigued and suspicious. His reaction would also depend on how Yassen treats him. If Yassen is harsh, Alex would be more resistant, but if Yassen is more manipulative and tries to befriend him, Alex would have a more complex reaction as he tries to figure out Yassen's true intentions.
There's a fanfic called 'Point Blanc: The Untold Side'. In this one, it explores what could have happened if Alex had made different choices during his time at Point Blanc. It adds an interesting twist to the familiar plot. It also gives more backstory to some of the minor characters, which makes the whole story more engaging.
One idea could be that Alex Rider is sent on a mission that overlaps with a CHERUB operation. They initially suspect each other as spies from different agencies but then realize they can work together. Maybe they have to infiltrate a high - security facility that is involved in some sort of illegal arms trading.
Yes, it can be considered realistic fiction. The adventures and challenges faced by Alex Rider often draw from real-world scenarios and human behaviors, giving it a sense of authenticity.
The villains in the Alex Rider series, when being read about in fanfiction by the characters themselves, could lead to different endings. For instance, if a villain like Yassen Gregorovich were to read a fanfiction where he has a different backstory, it could potentially change how he views his own actions in the original story.