In this kind of fanfiction, Stiles might decide to leave the pack due to feeling constantly underestimated or unappreciated. He could go off on his own and start to develop his own skills and relationships outside of the pack dynamic. Maybe he finds new allies who value him more than the pack did.
Well, perhaps in 'Stiles is done with the pack' fanfiction, Stiles has had enough of the pack's secrets and lies. So he breaks away. He could then focus on his studies or some personal projects that he had been neglecting while part of the pack. And who knows, he might even start a new group that is based on honesty and mutual respect, unlike what he felt in the old pack.
Well, perhaps Stiles gets used as a bargaining chip against his friends. The alpha pack might want something from Scott or the others, and they think Stiles is an easy target to control them.
Well, in such a fanfiction, Stiles might show extraordinary courage. He could use his wits to outsmart the pack when they're being unfair or overly aggressive. Maybe he'll stand up against their unjust decisions regarding how to deal with threats in the town.
Perhaps in this fanfiction, the Alpha pack kidnaps Stiles because they see him as a key to something bigger. Stiles is a very intelligent character, and they might want to use his brainpower for their own evil plans. He could be held in some sort of dark and spooky lair. His friends would then have to figure out where he is, and in the process, they might discover new things about the Alpha pack and their motives. There could also be some internal conflict within the Alpha pack regarding what to do with Stiles.
In some fanfictions, the pack meeting Stiles' family could lead to a lot of chaos at first. The pack has their own supernatural quirks, and Stiles' family might be shocked or confused. For example, they could mistake some of the pack's abilities for magic tricks at first. But eventually, they might come to accept the pack and see them as an extension of Stiles' life, leading to a big family - like bond.
Well, it could go in many ways. Maybe they would be really protective at first, sizing her up to make sure she's good enough for Stiles. They might test her loyalty or her ability to keep their secrets if they're a supernatural pack.
One reason could be that he's tired of always being in the background. In the pack, others with more obvious powers might overshadow him. So he decides he's done and wants to find a place where he can shine on his own.
Perhaps he feels that the other pack can offer him more opportunities for growth. In some fanfictions, the new pack might have access to different kinds of magic or knowledge that Stiles is eager to learn. So, he joins them to expand his skills and understanding.
One way is for the pack members to stand up for Stiles more often. If someone outside the pack is giving him a hard time, they should be there to protect him. Also, they could share their secrets with him, which would show that they trust him. This trust is an important part of any relationship and would help Stiles realize that they don't actually hate him.
Perhaps Stiles has found something else that he deems more important. It could be a new project, a relationship outside the pack, or a personal goal he wants to pursue. He might think that attending pack meetings is taking away time from this new focus in his life. Also, he could be facing some internal struggles, like self - doubt or a crisis of identity, and he needs some time away from the pack to figure things out.
One reason could be a misunderstanding. Maybe someone in the pack misinterprets Stiles' actions as being against the pack's interests. For example, if he's involved in something that looks like it's endangering the pack but in reality he's trying to protect it.