One idea could be exploring Robin's struggle to live up to Batman's legacy in the Batman Beyond era. Maybe he has to face a new villain who is specifically targeting the new Batman and Robin duo because of their connection to the old heroes. Another plot could involve Robin discovering a long - lost technology from the original Batman's days that holds the key to stopping a major threat to the future Gotham.
A great plot could be Robin trying to adapt to the high - tech world of Batman Beyond. He might have some trouble with the new gadgets and the more extreme flying capabilities of the new Bat - suit. For example, he could accidentally set off some of the suit's defenses while trying to figure it out. Also, a plot where Robin has to team up with an old acquaintance from his past who has some inside knowledge about a new criminal organization would be interesting.
One idea could be that Robin gets trapped in an alternate dimension where the villains are in control and Batman has to figure out a way to bring him back. Another could be a story where Batman is injured and Robin has to take on a major villain alone, learning to trust his own instincts more. Maybe a plot where they encounter a new, powerful ally who turns out to have a hidden agenda that threatens Gotham.
One idea could be exploring Inque's past before she became a villain. Maybe she was an ordinary person who got caught in some scientific experiment gone wrong. Another plot could involve a team - up between Batman Beyond and Inque against a greater threat that endangers the whole city. They could start off as reluctant allies but gradually learn to trust each other.
Maybe in a fanfic, there's a magical villain who curses Batman and Robin to be overly ticklish for a day. This forces them to rely on their other skills like detective work and stealth while dealing with this strange affliction. They might also have to ask for help from their allies, leading to some really funny interactions.
A cool plot could be that there is a rift in the multiverse that is causing chaos. Batman Beyond discovers it first and tries to get the Justice League's help. Along the way, they encounter alternate versions of themselves and have to work together to close the rift while also dealing with the differences and similarities between their various selves.
One idea could be that Batman Beyond travels back to the time of the original Batman and has to team up with him to stop a villain who has also time - traveled and is trying to change history for his own evil gains.
One idea could be exploring Robin's training in more depth. Maybe he has to face a new and extremely powerful villain all by himself during a training exercise that Batman has set up, which would test his skills and loyalty. Another plot could revolve around Batman and Robin's relationship being strained by an outside influence, like a media smear campaign against them that makes the public question their motives.
One plot idea could be Robin getting kidnapped and Batman having to use all his detective skills to find him. It would show their strong bond as father and son. Another could be Robin wanting to prove himself to Batman by taking on a tough villain alone but getting in over his head, and Batman coming to his rescue and teaching him a valuable lesson about teamwork.
Perhaps they could start off as rivals in the fanfiction. Batman from the present is skeptical of Batman Beyond's more high - tech approach. But as the story progresses, they learn from each other and become a great team. For example, Batman could teach Batman Beyond some of his old - school detective skills, while Batman Beyond shows Batman new ways to use technology in combat and surveillance.
One idea could be to have Batman and Robin face a villain who has the power to manipulate time. They would have to figure out how to stop the villain from changing history. Another could be that Robin gets kidnapped by a new, never - before - seen criminal and Batman has to use all his detective skills to find him. Maybe a third idea is that a powerful alien lands in Gotham and Batman and Robin have to team up with other heroes to deal with it.
Another concept could be the relationship between Robin and the new Batman. How do they interact? Do they have different ideologies? In fanfiction, this can be explored in depth. For example, Robin might be more impulsive while Batman is more calculating, leading to some interesting conflicts and character development.