In this kind of fanfiction, perhaps Hiccup would be in great danger. Drago might use Hiccup as a hostage to get something he wants, like controlling the dragons that are allied with Hiccup's people. He could also try to force Hiccup to reveal the secrets of his unique bond with Toothless.
In a 'hiccup kidnapped by drago fanfiction', there could be a lot of emotional turmoil. Hiccup's friends and family would be extremely worried. Astrid might lead the charge to find him. Meanwhile, Hiccup himself would be trying to outwit Drago. He could try to use his intelligence and knowledge of dragons to his advantage. For example, he might be able to communicate with some of Drago's captured dragons and convince them to help him escape.
Toothless is the most likely one. Their bond is so strong that Toothless would sense Hiccup's distress and come to his rescue. He could fly into Drago's hideout and cause chaos to free Hiccup.
Hiccup's friends would be extremely worried. Astrid, being Hiccup's closest friend and love interest, would probably be the first to take action. She would gather the other riders and start planning a rescue mission right away. Snotlout might initially be a bit hesitant, but the thought of losing Hiccup would push him to join in. Fishlegs would use his knowledge of dragons to figure out where Drago might be hiding Hiccup.
One possible plot twist could be that Drago kidnaps Hiccup to use him as a bargaining chip against the dragons. Maybe he wants to force the dragons to submit to his will by threatening Hiccup's life. Another could be that Drago discovers some special power within Hiccup that he wants to harness for his own evil purposes. For example, Hiccup's ability to communicate with dragons might be something Drago wants to use to control all dragons.
One great drago x hiccup fanfiction is 'The Unlikely Bond'. It delves into how Drago and Hiccup might form an unexpected alliance. Another is 'Drago's Redemption', which shows Drago's journey towards changing his ways in relation to Hiccup. And 'A New Beginning' where they start to see each other in a different light.
In such a fanfiction, Naruto's friends would likely go on a desperate search for him. Sasuke might put aside his pride and team up with the others. They would follow any leads, like tracking the kidnapper's chakra signature if possible.
If Naruto is kidnapped by Kumo in fanfiction, it could lead to a series of intense battles. Naruto himself might try to escape on his own using his ninja skills and the power of the Nine - Tails. His captors in Kumo would probably want to extract some sort of information from him, like the secrets of the Nine - Tails or Konoha's defense strategies. However, Naruto is a tough character and would surely put up a fight.
Well, in this kind of fanfiction, usually the main character might be in a state of fear at first. They could be held in a spooky castle or lair of the vampire prince. Maybe they would try to escape but find it difficult due to the vampire's powers and the unfamiliar surroundings.
In fanfiction, if Deku gets kidnapped, his friends from U.A. High would likely launch a rescue mission. Bakugo might be especially determined, as much as he tries to hide his concern. They would use their quirks in creative ways to track Deku down.
In the 'sonic is kidnapped by scourge fanfiction', Sonic's friends would surely be worried sick. Tails might start using his gadgets to track Sonic down. Meanwhile, Sonic himself would be constantly thinking of a way out. Scourge could have kidnapped him for various reasons, like to prove he's stronger or to get some sort of information from Sonic. Sonic would not go down without a fight though, and he'd be looking for any opportunity to break free and foil Scourge's plans.
In a Destiel - centered fanfiction where Sam is kidnapped, perhaps it's all part of some grand scheme to make Dean realize his true feelings for Cas. The kidnappers might be some over - zealous fans within the story who think that by causing chaos, they can bring about the Destiel endgame. They could hold Sam in some strange, other - dimensional location and send Dean and Cas on a quest to find him.