Ash from Pokemon often makes an appearance in these fanfictions. Since he's the main character in Pokemon, he can be easily integrated into the Power Rangers' world, maybe as a special Ranger or an ally.
Then there's Pikachu. It's so iconic in Pokemon that in fanfiction it can be a central figure in the story. It might befriend the Power Rangers or have some sort of super - powered transformation that is related to the Rangers' powers. For example, Pikachu could transform into a Power Ranger - like form to fight alongside the human Rangers against a common enemy.
The leader of the Dark Rangers is often a popular character. They usually have strong leadership skills and powerful dark abilities. For example, a character who can control shadows and use them to attack or defend.
Pokemon that have strong personalities in the fanfiction also become popular. Like a Pikachu that is not just cute but also has a sassy and brave side, and it teams up with a ranger in a very unique way. This Pikachu might be a favorite among readers.
Naruto himself is often very popular. His energetic and determined personality makes for great crossovers with the Power Rangers. Then there's Kakashi, with his cool and mysterious nature. Rangers might be intrigued by his sharingan and ninja skills. Also, Tommy Oliver from the Power Rangers is a favorite. His long history in the Power Rangers series and his various ranger forms can bring a lot to a crossover story.
Sky Tate is often a popular choice. His journey from being a bit of a hot - headed rookie to a more mature leader provides a lot of room for character development in fanfiction.
In Naruto, Naruto Uzumaki himself is often very popular. His determination and growth throughout the series make him an appealing character in fanfiction. In the context of a harem, his friendly and somewhat naive nature can attract female characters from both universes. From Power Rangers, the Red Ranger is usually a favorite. He represents leadership and strength, which are attractive qualities. In a harem fanfiction, he might be seen as a protector figure for the female characters. Also, characters like Sakura from Naruto are popular as she can add a bit of a love - triangle dynamic with Naruto and the Power Rangers characters.
Optimus Prime is often a popular character. His leadership and strong moral compass make him a great addition to any crossover. He can provide guidance to the Power Rangers and his powerful form is always an asset in battles. Another popular one is Tommy Oliver from the Power Rangers. Given his long - standing popularity and his many different Ranger forms, he has a lot of potential for interesting interactions with the Transformers.
Harry Potter is often one of the most popular. Fans like to see him use his Gryffindor courage in the world of Power Rangers. Hermione is also popular as she can bring her intelligence and knowledge of magic. From Power Rangers, Tommy Oliver is a favorite. His experience as a Ranger can be interestingly combined with the magic world of Harry Potter.
Emily is also a favorite. Her kind - hearted nature and her growth as a Ranger can be interesting to write about. You can create stories about her learning new powers or dealing with personal challenges.
Natsu from Fairy Tail is often popular. His fire - based magic and hot - headed personality can create some really exciting interactions with the Power Rangers. He might be eager to prove himself against their high - tech powers.
Definitely Andros. He's the leader of the Power Rangers in Space and his leadership skills, as well as his emotional journey throughout the series, make him a great focus. Also, Astronema, as the main villain. She has a lot of layers to her character. She was once Karone, which gives a great opportunity for redemption arcs and exploring the grey areas between good and evil in fanfiction.