First, you need to have a good understanding of the Dragon Ball Xenoverse 2 universe. Know the characters, their personalities, and the world they live in. Then, when creating the lemon part, be very careful as it involves adult themes. You should make sure it's in line with the overall tone of the game world as much as possible.
Goku is often a very popular character in Dragon Ball Xenoverse fanfic. His iconic status and powerful abilities make him a natural choice for writers to include in their stories. He can be the hero who saves the day yet again or be put in a situation where he has to learn new things.
One interesting storyline could be about a new character who has a unique ability and tries to fit into the Dragon Ball universe. For example, a character with the power to manipulate time in small ways, and they use this power to help or hinder the main events in Xenoverse. This can create a whole new set of challenges and interactions with the existing characters like Goku and Vegeta.
Definitely Trunks. His time - traveling backstory makes him a perfect fit for the Xenoverse 2 setting. You can explore different versions of him from various timelines. Frieza is also a fan - favorite. His evil nature and lust for power can be the source of many conflicts in a fanfic. And don't forget about Android 18. Her strength and unique personality can make for an engaging character in the story.
One idea could be a story where a new character from an alternate timeline enters the Xenoverse 2 world. They have a unique power that disrupts the normal flow of time rifts. This new character teams up with the Time Patrollers to fix the chaos they unknowingly caused. Another could be a fanfic focusing on the backstory of an existing minor character in the game, like how they came to be a part of the Xenoverse in the first place.
One idea could be a crossover with other popular anime like Naruto. Picture Goku meeting Naruto and having a friendly sparring match. Another could be a crossover with the DC Universe, where Vegeta and Superman have a showdown to see who's stronger. Or perhaps a crossover with the Final Fantasy series, with the Dragon Ball characters in a world filled with magic and summons.
The story of Dragon Ball Xenoverse 2 lasts for approximately 25 hours if you focus mainly on the main quests and don't get too sidetracked. But if you take your time and do all the side missions and extras, it can stretch to 40 hours or more.
The story of Dragon Ball Xenoverse doesn't have a set duration. It all depends on how thorough you are. If you rush through, it could be shorter, but if you take your time and do all the extras, it could be well over 20 hours.
To start a Dragon Ball Xenoverse Crossover Fanfic, begin by brainstorming the two universes you want to combine. Let's say you choose to cross it with the Pokemon world. Think about how the power systems will interact. Ki and Pokemon abilities are very different. You need to find a way to make them coexist in your story. Outline your story structure. Decide if you want a linear story or one with flashbacks. Also, develop your main character's journey in this new crossover world. They should have a clear goal, like finding a way back home or stopping an evil that threatens both universes.
At the end of the story, the main character has likely become extremely powerful and has faced numerous challenges. They might have saved the Dragon Ball Xenoverse from various threats like powerful villains who were trying to disrupt the time - space continuum. Also, they could have made important alliances with different characters from the Dragon Ball universe.