A third plot twist could be that the attack is a diversion. While Clary is fighting the demon, something much more significant is happening elsewhere. Maybe a powerful artifact is being stolen or a key location is being infiltrated, and by the time she realizes it, she has to race against time to stop the real danger.
Alec might also come to her rescue. As a skilled Shadowhunter, he has a strong sense of duty. Plus, he's part of Clary's group, and he wouldn't stand by and let a fellow Shadowhunter be attacked by a demon.
Another character who has a personal vendetta against Clary or her family. For example, a jealous rival or someone who blames her family for past misfortunes. This would add a layer of drama and personal conflict to the fanfiction.
Well, she might be rescued by her friends. In many fanfictions, her Shadowhunter comrades would come to her aid, using their unique skills to fend off the attackers.
One possible plot twist could be that Sebastian's true motives for getting Clary pregnant are revealed to be part of a larger, darker scheme. Maybe he plans to use the baby for some sort of power - play within the Shadowhunter world.
One possible plot could be that Clary gets drunk and ends up confessing her hidden feelings to someone she has a crush on.
A great plot twist would be if Raven is kidnapped and taken to a place where she meets her long - lost family members, but they're the ones who kidnapped her because they need her help to fight against a common enemy, and they knew this was the only way to get her attention. Another plot twist could be that the kidnapper has a split personality, and one side is good and wants to free Raven, while the other side is evil and wants to keep her captive. And the last plot twist might be that Raven is kidnapped into a parallel universe where everything is different, and she has to find a way back while also dealing with the kidnapper in this strange new world.
One possible plot twist could be that it was all a misunderstanding or a magical prank. Maybe a mischievous character cast a spell that made it seem like Gon was pregnant by Hisoka, but in reality, it was just an illusion to create chaos. Another could be that the pregnancy is part of a prophecy that has far - reaching consequences for the entire world they exist in, and they have to figure out how to deal with it.
Another option is a group of demons who have a vendetta against Clary or the shadowhunters in general. They might use torture as a way to break her spirit and gain information about the shadowhunters' defenses.
One possible plotline could be Clary's friends finding out about her being tortured and launching a rescue mission. They might face many obstacles on their way to save her, like fighting off the torturers' guards.
In some fanfictions, Clary might get hurt because of a betrayal within the Shadowhunter community. For example, someone she trusts might lead her into a trap where she gets injured. It could be a complex plot where the betrayer has their own motives, like jealousy or a desire for power. This would not only physically harm Clary but also emotionally shatter her trust in those around her.