One idea could be a crossover with the Naruto universe. Gohan as SSJ2 could end up in the Hidden Leaf Village and interact with the ninjas. Maybe he helps in a battle against a powerful enemy using his Saiyan powers.
You could start by establishing the setting and the situation. Say you choose a crossover with the Avatar: The Last Airbender world. Begin with Gohan SSJ2 sensing an unusual energy in that world and deciding to investigate. This sets the stage for the story to unfold.
One common theme could be the struggle between Gohan's good nature and the newfound dark side. Maybe it involves his relationships being strained as his dark side emerges. For example, his relationship with his family and friends might change as he becomes more aggressive or unpredictable.
Gohan will most likely encounter other Z - fighters like Krillin and Tien. They were all part of the group back then. Also, there's a good chance he'll meet Master Roshi. Roshi was a key figure in Goku's training, so his interaction with Gohan could be really interesting. He might also come across Bulma, who was always involved in the Dragon Ball story, either by accident or because he needs her help with some time - related technology or something.
It can create new power dynamics. If Gohan has a dark side, it might make him a more unpredictable and potentially dangerous force in the universe. Enemies might see this as an opportunity to manipulate him or use his power for their own gain.
In this fanfiction, Gohan might change important events in the past. For example, he could prevent certain villains from getting stronger or save characters who died previously.
To write user stories in TFS, start by understanding the user's goal. Then, break it down into simple, actionable steps. Make sure to keep the language simple and understandable for all involved.
One popular character is often the young and determined trainer who starts their journey with just a single pokemon. They grow and develop over the course of the story, facing many challenges.
I'm not entirely sure specifically what the 'Android 16 TFS back story' is. It could be related to a custom Android 16 build in a particular project or by a certain group (TFS could stand for something like Team Foundation Server in a different context but that's a bit of a stretch here). Maybe it's a very niche or new development.
One interesting story could be about a trainer's journey in the pokemon tfs world where they encounter rare and powerful pokemon. They might face challenges like difficult terrains and strong rival trainers. This makes for an exciting adventure as they strive to become the best trainer.