Harry may also feel a sense of adventure. Despite the situation, he's used to facing strange and dangerous things. He might start to think about how he can use this situation to his advantage, like finding out more about his parents or the secrets of the wizarding world that Sirius might know. He could be a bit excited as well as scared. For example, he might be thinking that this could be a chance to get away from the Dursleys for good.
He might also use his wits and knowledge of the wizarding world. For example, he could use a vanishing cabinet or a secret passageway that Bellatrix doesn't know about. Since he has spent a lot of time at Hogwarts, he may be aware of some hidden routes that could lead him to safety.
At first, Harry would likely be shocked and angry. He's used to being in dangerous situations, but being kidnapped by Fleur, someone he thought was an ally, would be a big betrayal. He'd probably try to fight back immediately, using his magic if he could.
Yes, there might be such fanfics out there. Fanfic writers often come up with all sorts of creative and sometimes out - of - the - box scenarios. You can try searching on popular fanfic websites like Fanfiction.net or Archive of Our Own. Just type in the title keywords and see what pops up.
Harry could also try to reason with Voldemort. He might remind Voldemort of the prophecies and how killing him might not be in Voldemort's best interest. He could also try to appeal to any bit of humanity that might still be left in Voldemort, although that's a long shot.
Harry would probably be very defiant at first. He has faced Voldemort (Tom Riddle) before and he won't go down without a fight. He would likely try to use his magic skills to escape or at least hold Tom Riddle off until he can find a way out.
In a fanfic where Voldemort kidnaps Harry, it could lead to a lot of intense situations. Harry might be used as a bait to lure his friends into a trap. Or Voldemort could try to turn Harry to the dark side, using various forms of dark magic and psychological manipulation.
Well, it could be that Snape has some false information that makes him think Harry is in immediate danger from the wrong people at Hogwarts. So, he kidnaps Harry to protect him. Maybe he takes Harry to a secret location like an old, abandoned wizarding house in the Forbidden Forest. There, he tries to figure out what to do next while Harry is really confused and angry at being kidnapped.
It could end with Snape realizing he was wrong. He apologizes to Harry and they form an unlikely alliance. They return to Hogwarts together and Snape has to face the consequences of his actions from Dumbledore.