In the fanfic, the Teen Titans could be in a situation where they are being mind - controlled. Batman, with his strong will and training in resisting mind - control himself, could break the control on the Titans. He might use a combination of technology and his own mental discipline. For instance, he could use a device that emits a frequency disrupting the mind - control signal. Then, he would protect the Titans from the villains who were controlling them until they fully recover.
One idea could be a crossover where Batman Beyond teams up with the Teen Titans to face a new threat in Gotham. Maybe a powerful villain has emerged who is using advanced technology that only Batman Beyond can understand, and the Titans' unique powers are needed to combat the villain's minions.
In the fanfic, Batman might use his advanced gadgets to save the Teen Titans. For example, he could use his grappling hook to pull them out of a dangerous situation like a collapsing building. His Batmobile could also be used for a quick escape or to ram into villains threatening the Titans.
In some fanfics, the moment when the Teen Titans and Batman Beyond combine their powers to defeat a seemingly invincible villain is always a highlight. For instance, if the villain has the ability to absorb energy, the Titans use their powers in a coordinated way to distract the villain while Batman Beyond figures out a way to disrupt the villain's power - absorbing mechanism.
One possible interpretation is that it's about the characters' unique mental abilities or traits being symbolized by colors. For example, a character with telepathic powers might have a distinct 'color' in their mind when using their ability.
Batman's origin in Teen Titans Go is somewhat of a comical take on the traditional origin. He witnessed the death of his parents in Crime Alley which drove him to fight crime. But in the Teen Titans Go version, it's presented with their signature humor.
One possible plotline could be that Raven's pregnancy is a part of a prophecy. The Teen Titans then have to protect her from those who would want to harm her or the unborn child because of the significance of the prophecy. This could lead to a lot of action - packed scenes as they fend off villains.
A cool fanfiction storyline could involve the Teen Titans being transported to an alternate version of Gotham where Batman is a villain. They have to figure out what went wrong and try to turn Batman back to the good side while also dealing with the chaos in this new Gotham.
One interesting Teen Titans Batman fan fiction could be one where Batman has to train the Teen Titans in his unique combat and detective skills. Maybe in a story where Gotham is under a new threat that requires the combined efforts of the Titans and Batman's expertise.
In a 'Teen Titans meets Batman' fanfiction, there could be an epic battle. Maybe the Teen Titans initially mistake Batman for a threat and they engage in a fight. Robin, being Batman's sidekick, might have to step in to clear the misunderstanding. Then, they could team up to face a common enemy like the Joker or Slade. It would be amazing to see how Batman's detective skills and the Teen Titans' unique powers combine to solve a mystery or save the day.
One possible plotline could be that Jason has been captured by a new and dangerous villain in Gotham. Batman uses his detective skills to track Jason down. He then has to fight through a horde of henchmen to reach Jason. Once he does, he has to deal with some sort of trap set by the villain to keep them from escaping easily.