Meteora herself is of course essential. She has a complex backstory and a lot of potential for character development. Star would also be a great addition as she and Meteora have an interesting dynamic in the show. Their interactions could be explored further in a fanfiction.
Adding Eclipsa to the fanfiction could be really cool. As an important character in the 'Star and Forces of Evil' world, her connection to Meteora's heritage and her own powerful magic could add depth to the story. Her different perspective on the magical world and its rules could drive the plot in unexpected directions.
Tom is another character that could be included. His relationship with Star and his own powers could create some interesting storylines when combined with Meteora. He could be an ally or an adversary depending on the plot. Also, Pony Head would bring some humor to the fanfiction with her sassy personality and unique appearance.
A powerful dark wizard from another dimension could serve as the main antagonist. He might be interested in Meteora's unique powers and wants to use them for his own evil purposes. So he constantly tries to capture or manipulate her throughout the fanfiction.
There could be a fanfiction where Meteora has to face a new, more powerful threat in the 'Star and Forces of Evil' universe. This would put her in a position where she has to use her skills and intelligence to save the day. For example, a mysterious dark force from another dimension invades and she's the only one who can stop it. It would be full of action and adventure.
Another interesting plot could be Meteora forming an unlikely alliance. For example, she teams up with a group of misfits who are also on a quest for something. Together, they face various challenges and in the process, Meteora learns about friendship and trust.
Well, from the 'Star vs the Forces of Evil' universe, obviously Star and Marco are must - includes. They are the main characters and their dynamic is really interesting. In a crossover with 'Gravity Falls', Dipper and Mabel would be great additions. Dipper's curiosity and Mabel's wackiness could create some really fun interactions with Star and Marco. They could all investigate some strange phenomena that combines the mysteries of both Gravity Falls and Star's dimension.
Well, obviously Ludo himself is a central and interesting character in these fanfictions. His complex personality, with his mix of ambition and bumbling nature, makes for great storytelling. Another great character can be Buff Frog. His loyalty to Ludo in some fanfictions can lead to some really heartwarming and also action - packed moments.
Obviously, Infinite himself is a must - include. His complex character with his powers and his connection to the Phantom Ruby can drive a lot of the story. Sonic is also essential as he is the main hero and his interactions with Infinite can be really interesting. Tails could also be included as he can provide the technical support and his loyalty to Sonic adds another layer to the story.
A great 'Star vs the Forces of Evil' fanfiction often has well - developed characters. It stays true to the personalities of the original characters like Star, Marco, and the others. For example, if Star is written as being overly timid when she's actually a brave character in the show, it won't be as good.
Well, obviously Star is one of the main characters. She is often pitted against Toffee in the show, and in fanfictions about Toffee's abs, she would be trying to figure out his secrets which might be related to his physical features like his abs.
Obviously, Star could be one of the main characters. She could have an adventure in the mermaid world and her character traits like her fearlessness and her ability to adapt would make for an interesting story. Another main character could be a mermaid named Marina. She could be the one who helps Star understand the mermaid world and they form a strong friendship.
Well, Star is often a popular one to be genderbent. Since she's the main character, seeing her as a male version with all the changes in personality and powers can be really interesting to fans.