A time - travel plot would also be cool. Power Girl could be sent back in time to a period when her powers were not fully developed. She would have to rely on her wits and the help of the people in that era to get back to her own time, all while trying not to change history too much.
Once upon a time, Power Girl was flying over the city when she noticed a building on fire. She quickly swooped down and used her super strength to carry people out to safety one by one. She then used her heat vision to put out the fire, saving the entire building. After that, she was hailed as a hero by the city's inhabitants.
Yes, there are many. You can start by looking on fanfic platforms like Archive of Our Own. Just use the search filters to exclude any BDSM - related tags and look for stories that focus on Power Girl's heroic adventures, her relationships with other superheroes in a more traditional sense, or her own character development outside of such adult - themed concepts.
One plot idea could be that Spiderman and Power Girl team up to stop a powerful villain who is causing chaos in both their cities. They start off not getting along due to their different methods but gradually learn to respect each other.
A plot could involve Power Girl coming from an alternate universe and Superman having to help her adjust to his world while they also discover a connection between their two universes that could be dangerous if not fixed. This would explore their relationship as cousins and how they deal with the differences in their upbringings.
One idea could be a body - switching with a regular person who then has to deal with Power Girl's powers and responsibilities. They might struggle to control her super strength and flight, leading to some comical situations in the city. For example, accidentally crashing into buildings while trying to fly. Another plot could involve a villain who switches bodies with Power Girl to gain access to her powers and use them for evil. Then, Power Girl has to figure out how to get her body back while trapped in the villain's weaker form.
A plot could revolve around a team-up that no one expected. Like a villain and a hero from different universes having to work together in the Tournament of Power. They start off distrusting each other but gradually learn to respect and rely on one another. This could add a whole new layer of drama and character development to the fanfiction.
One idea could be exploring the origin of the 'power of darkness'. Maybe it was a forgotten magic that gets rediscovered by a young protagonist.
One idea could be a time - travel plot. Imagine Kuroka somehow gets sent to the Naruto universe in the past. Naruto could help her adjust and in the process, they discover a plot by an ancient enemy that they must stop together. This would involve a lot of world - building and exploration of both characters' abilities in a new context.
A fanfiction plot could be about a new threat that is specifically targeting the Omnitrix and the Power Rangers' power source. Ben and the Rangers have to figure out how the enemy is doing this and stop them. Along the way, they discover a hidden connection between the two power systems that was unknown before. There could be some character development for both Ben and the Rangers as they struggle to protect what they hold dear.
One interesting plot idea could be a crossover between the Power Rangers and the Teenage Mutant Ninja Turtles. The Power Rangers could team up with the turtles to fight a common enemy like an alien invasion that threatens both their worlds. Another idea is a crossover with the Ghostbusters. The Rangers could work with the Ghostbusters to deal with supernatural threats that are beyond the capabilities of either group alone. And a third idea might be a crossover with the Transformers. The Rangers and the Autobots could combine their powers and technology to protect Earth from a powerful Decepticon threat.