It could be that the Red Dragon Archfiend is a form of dark magic that Voldemort or his followers are trying to use. Harry then has to face this new threat. He might get some help from Dumbledore's Pensieve, where he can look at the memories of previous wizards who have dealt with similar powerful and dangerous creatures.
The Red Dragon Archfiend could be connected to a prophecy. Just as there were prophecies about Harry and Voldemort. This prophecy could involve the dragon being the key to either saving or destroying the wizarding world, and Harry has to figure out which path to take regarding this dragon.
To plant red herrings, start by creating multiple possible suspects or storylines. Make the reader think one thing is going to happen, but then surprise them. Also, use ambiguous language or events that could be interpreted in different ways.
One popular 'archfiend light novel' could be 'Overlord'. It features a powerful archfiend - like character in a unique fantasy world. The story is full of interesting power plays and exploration of a game - turned - real world.
Well, one interesting scenario could be when Jaden uses his dragon deck to face a really tough opponent in a high - stakes duel. The dragons in his deck might have some unique abilities that help him turn the tide of the battle.
One possible plot could be that Naruto discovers Alexis' Dragon Deck and is intrigued by the power it holds. He might ask her to teach him about the deck, leading to a series of adventures where they face off against various opponents using the unique strategies of the Dragon Deck combined with Naruto's ninja skills.
One idea could be a story where Jaden's dragon deck evolves over time. Maybe he discovers a new dragon card during an adventure in Duel Academy. This new card has unique powers that he has to learn to master, leading to intense duels against his rivals.
In many 'archfiend light novel' works, you often have a central character who is either an archfiend or has some connection to one. For instance, in 'Overlord', Ainz Ooal Gown is the main character who was once a human but now has the form and powers of an archfiend - like being. He is extremely powerful and has to navigate ruling over a world filled with various races and factions.
There might also be a mysterious character who has knowledge about the origin of Jaden's dragon deck. This person could show up at crucial moments to give Jaden some crucial information about his deck, like how to unlock its full potential or the history behind some of the dragon cards. This character would add an element of mystery and intrigue to the fanfiction.
Naruto's character could develop by learning patience and strategy from the Dragon Deck. Usually, Naruto is impulsive, but dealing with the deck's complex mechanics might make him more calculated. Alexis, on the other hand, could become more confident in her leadership skills as she and Naruto face challenges together. She might start to rely on Naruto's unique abilities more, and this would change her view of teamwork.