Maybe in the fanfiction, Jungkook turns into a vampire due to an ancient curse. His transformation changes his appearance slightly, with his eyes turning a deep red when he's hungry. He starts to feel alienated from the other members as he can't participate in normal human activities like eating regular food. However, he also meets other vampires who teach him how to control his urges and he eventually finds a way to balance his vampire life with his life as a member of BTS.
The plot could involve Jungkook being turned into a vampire by a female vampire who falls in love with him. At first, he's terrified of what he's become. But as time passes, he begins to accept his new identity. He has to deal with the fact that he'll live forever while his bandmates will age. This could create a lot of emotional turmoil for him as he tries to decide whether to tell the others or keep it a secret and how to continue his career in BTS while being a vampire.
One possible plot could be that JK, as a vampire, struggles to control his newfound thirst for blood while still trying to be part of BTS. He might be afraid of hurting his bandmates and tries to isolate himself at first. But then, through their strong bond, the other members help him come to terms with his new identity and they find a way to keep his vampire nature a secret from the public.
One idea could be that Jungkook is bitten by an ancient vampire during a late - night encounter in a mysterious forest. He then has to struggle with his newfound thirst for blood while still trying to maintain his relationships with his friends and family. He might find himself drawn to a particular person whose blood has a special scent that both attracts and repels him.
Another theme is friendship. In these fanfics, the relationship between Jungkook and the other BTS members is often explored. They might have to adapt to his new vampire self, and it shows how strong their bond is.
The other members might be initially shocked. Jin, being the eldest, would probably try to find a way to 'cure' Jungkook. Suga would be more reserved but also worried, and might start researching about vampires. J - Hope would be the one trying to cheer Jungkook up, telling him that it's okay and they'll figure it out together. RM, as the leader, would be concerned about how this will affect the group's image and their future activities, but also about Jungkook's well - being.
One plot idea could be that Jungkook, as a vampire, gets angry when a fanfiction writer reveals his true identity to the public in the story world. He then has to deal with the chaos that ensues as other vampires and humans react. Another could be that he's angry because a fanfic portrays him in a way that goes against his vampire code. For example, if it shows him being cruel to the innocent when he's actually a protector of sorts.
Jungkook's character could develop in the way that he becomes more empathetic towards other vampires. He realizes that they are not all monsters, just like he is not. He might start to fight for vampire rights, or at least for a more peaceful co - existence between vampires and humans. His relationships with his human friends would also change, some becoming more distant while others become closer in a different way.
One plot idea could be that Jungkook, as a vampire, is trying to hide his identity in the modern world. He could be a student by day and a vampire hunter's target by night. Another idea is that he falls in love with a human who is somehow involved in vampire lore research, and he has to decide whether to turn her or let her live a normal life. Maybe he's also part of a secret vampire society within BTS, and they all have different powers and roles in that society.
One popular 'bts newly turned vampire jungkook fanfic' is 'Vampire Jungkook's New Beginning'. It's a really interesting story that delves into how Jungkook copes with his new vampire life within the BTS universe.
One common theme is the struggle with his new vampiric nature. He might be confused about his new powers and instincts. For example, he could be fighting the urge to drink blood in some stories.
In fanfiction, he could be a very curious vampire. Jungkook is known for his eagerness to learn new things in real life, and as a vampire, he might be interested in modern human culture. He could be nocturnal, of course, and have a heightened sense of hearing and sight. His loyalty to his vampire clan or to his human friends would be a strong character trait, and he might be conflicted when the two worlds collide.