Well, she could be the target of an ancient prophecy. The villains believe that by defeating her, they can gain ultimate power. So she has to constantly be on the run while also trying to figure out how to stop the villains. Along the way, she meets other female warriors who have been in similar situations and they form an all - female alliance to fight back. This could lead to some really cool team - up battles and a great story about female empowerment within the Power Rangers universe.
One plot idea could be the female red ranger having to prove herself in a male - dominated ranger team. She could face discrimination at first but then show her unique skills in combat and leadership, winning over her teammates. Another idea is that she discovers a new power source that is related to her femininity, like a power that is linked to the power of nature and female intuition. Maybe she has to go on a solo quest to master this power while the rest of the team is dealing with a different threat.
One idea could be the Black Ranger getting lost in a parallel dimension. He has to use his skills and wits to find his way back home while facing new enemies and making unexpected allies. Another plot could involve him losing his powers temporarily and having to rely on his martial arts training to protect the city.
One idea could be a female Power Ranger who has the ability to communicate with animals and uses this to gain an edge in battles. For example, she might get help from a group of eagles to spot approaching enemies from afar.
A great plot might involve the Black Ranger getting lost in a different dimension while on a mission. In this dimension, he has to adapt to new rules and powers while trying to find his way back. He could meet new allies or face enemies that are unique to that place. Also, a plot about the Black Ranger having to train a new recruit who has a lot of potential but also a lot of recklessness could be interesting.
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.
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 idea could be a story where a new ranger from a different planet joins the SPD team. They have unique powers that the others don't, and at first, there's some tension as the team has to adjust to their new teammate. But eventually, they all work together to defeat a powerful new villain.
An interesting plot for Power Rangers OC fanfiction could be an OC who starts off as a villain's minion but then has a change of heart. This OC might be forced to do the villain's bidding at first, but through interactions with the Power Rangers, they see the error of their ways. They could then use their knowledge of the villain's plans to help the Rangers. Maybe this OC has a special ability that is crucial in defeating a major villain in the end.
A more character - centered plot could be about the relationships between the Rangers. Like a story where Emily struggles with her feelings for Kevin, and how this affects their teamwork as Power Rangers. This could add an interesting layer of drama to the fanfiction.
One plot idea could be a baby Power Ranger discovers their powers early. For example, the baby might accidentally activate their morphing ability while playing with a shiny object that turns out to be related to their Ranger powers. Another could be that the baby is the key to saving the Power Rangers from a new villain who has a weakness only the baby can exploit. Maybe the baby has a special power of innocence that can counter the villain's dark magic.
One idea could be a story where a new ranger has to hide their identity as a ranger from their family who are against any form of superhero activity. It adds a layer of drama and secrecy.