It could be a powerful and evil ninja from a rival village who has killed one of Boruto's close friends or family members.
In some fanfic scenarios, it could be a corrupted shinobi within the Hidden Leaf Village itself. This shinobi could have betrayed the village in some way that directly affects Boruto or his loved ones, like stealing important secrets that lead to the endangerment of the village. And Boruto, being the determined and loyal person he is, would seek revenge against this traitor.
It could be a rogue ninja who has a personal vendetta against Boruto's family. This ninja might have caused harm to Boruto's father Naruto in the past, and now Boruto is determined to make him pay.
In a 'Boruto Seeks Revenge Fanfic', Boruto might seek revenge against an enemy who has wronged his family. For example, if a new villain attacks Konoha and harms his father Naruto. Boruto could train intensively to gain power and then set out on a journey to find and defeat this foe.
Well, maybe Boruto's family or friends are hurt by a powerful enemy. So he decides to train hard and seek revenge. He might travel to different places to learn new jutsu and gather allies along the way.
It could be the Kara organization. They've been shown to be interested in Boruto's Karma mark in the original series, so they might have finally made a move to abduct him in the fanfic.
Perhaps the target is Howard. Howard might have made a joke about Sheldon's mother that Sheldon didn't appreciate. As a result, Sheldon could try to get revenge by interfering with Howard's work on the space station projects, causing minor but annoying setbacks.
Sarada could also be a main character. She is strong - willed and intelligent. She could be investigating a case of a missing - nin who is suspected of being involved in some sort of conspiracy against the Uchiha clan. This would give her a chance to show her detective skills and her loyalty to her clan.
It could be a rogue ninja who wants to use Boruto to get to Naruto. Maybe someone who has a grudge against the Hokage.
It could be a resurrected Orochimaru. He has always had an interest in power and the Akatsuki. He might return, more powerful than ever, and take control of the Akatsuki in the Boruto era, using them to carry out his evil plans, like creating an army of super - ninjas using some dark jutsu.
Here are some recommended revenge novels for the target: 1. " Mistaken Evil Prince ": This romantic youth and youth campus novel, the protagonist is also constantly entangled with underworld figures, and the plot is full of revenge. 2. "Duel! Dragging Girl for Revolution ": This romantic youth-youth campus novel might also contain a revenge plot. 3. " Return of the Three Vengeance Goddesses ": This is a revenge novel by Seven Shells. 4. " The Revenge of the Third Princess: The Road to Revenge and Love " was a revenge novel by Qian Yixin. 5. The Tokyo Avengers: My Big Brother Is the Place was a revenge novel by Yi Zhe. 6. [The Goddess of Vengeance Returns Strongly]: This is a revenge novel by Distracted Thoughts. Please note that the novels recommended above may only be examples of some revenge novels. There are many other revenge novels to choose from.
One possible reason could be a lack of inspiration. Creating fanfic requires continuous creativity, and if Boruto has run out of new ideas, he might quit. Another reason could be time constraints. Maybe he has other important commitments in his life, like school or work, that leave him with no time for fanfic writing. Also, it could be due to negative feedback. If he received a lot of criticism on his fanfics, it might have discouraged him from continuing.