One great storyline could be the Black Ranger having to face a new, powerful enemy alone. Maybe he gets separated from the rest of the Power Rangers and has to rely on his own ninja skills and inner strength to survive and defeat the foe. Another could be a story where the Black Ranger discovers a new power within himself that has been dormant all this time. It could be a power that has a connection to an ancient ninja legend, and he has to learn to master it while also dealing with the regular threats the Power Rangers face.
One potential ally could be an old ninja master who has been in hiding. The Black Ranger might stumble upon this master while on a solo mission, and the master decides to train him further, becoming a powerful ally in his battles. Another could be a mysterious figure who has the power to control the elements in a different way than the Rangers. They could team up with the Black Ranger to fight a common enemy that is immune to the normal Ranger powers.
One idea could be to have the Ninja Steel Rangers cross over with the original Mighty Morphin Power Rangers. They could team up to fight a common enemy that is too powerful for either team alone. Maybe Lord Zedd and Galvanax form an alliance, forcing the two ranger teams to combine their powers and zords in new and creative ways.
In some fanfictions, Wes's death could be a heroic sacrifice. Maybe he gives up his life to save the world from a powerful enemy that the Time Force rangers couldn't defeat otherwise. His death would have a profound impact on the other rangers, especially those who are close to him. They might struggle with grief and guilt, but also find the strength to carry on his legacy.
Well, he could die in a battle against a new and extremely powerful villain. Maybe the villain has some sort of weapon that can nullify Wes's powers and then fatally wound him.
First, know the characters well. You need to understand the personalities, powers, and relationships of the Power Rangers Star Force. For example, if you're writing about the Red Ranger, remember his leadership qualities. Then, come up with an interesting plot. It could be a new villain, a different power source, or a threat from another dimension.
One great 'Power Rangers Star Force' fanfiction is 'The Lost Ranger'. It tells the story of a new ranger who has to prove himself to the team. It has exciting battles and interesting character development.
First, you need to establish a strong villain. For example, a new villain that has the power to disrupt both the Ninja Steel Rangers' world and the world they are crossing over into. Then, create a conflict that forces the rangers to seek help from the other group. Keep the action scenes exciting and use the unique abilities of each ranger and the crossover characters.
Nick Russell is often a popular choice. As the Red Mystic Ranger, he has a central role and his leadership qualities can be explored further in fanfiction. Also, Vida Rocca, the Pink Mystic Ranger, is quite popular. Her strong - willed personality and her relationships with the other Rangers can make for interesting storylines. Another popular character is Xander Bly, the Green Mystic Ranger, because of his comical side and his growth throughout the series.