Another plotline might be that the forces of evil launch a sudden attack on Comet's homeland. Comet has to fight back and in the process, uncovers a conspiracy within the forces of evil that could be used to their advantage. He then uses this knowledge to turn the tables on them.
A 'Comet vs the Forces of Evil Fanfic' could explore many things. It might focus on Comet's unique powers and how they are pitted against the forces of evil. For example, Comet could have some special magical abilities that the forces of evil are trying to either steal or nullify. Maybe Comet has to go on a journey to find a powerful artifact to defeat the forces of evil once and for all.
One possible plotline could be that the starless star is on a quest to find its true identity and in the process has to battle the forces of evil. Another could be that the forces of evil are trying to destroy something precious and the starless star is the only one who can stop them.
Perhaps Marco is injured while trying to protect Star from an assassin sent by one of the villains in the series. This could lead to a story where Star blames herself for his injury and has to overcome her guilt while also taking care of Marco and finding a way to stop the assassin from coming back for another attempt.
Perhaps there's a plotline where they are on opposite sides of an issue within the village. This causes them to oppose each other physically. It could be something related to a new law or a decision made by the Hokage. As they fight, they also have to deal with the moral implications of their actions. Sakura might be fighting for what she believes is right for the well - being of the villagers, while Neji has his own reasons rooted in his clan's values or his personal code of honor. Their battle would not only be about physical strength but also about the clash of their ideals.
One possible plotline could be that Broly, in his rage, accidentally provokes Beerus. Broly, not knowing who Beerus is, attacks him. Beerus, initially amused, decides to teach Broly a lesson but soon realizes that Broly's power is growing at an alarming rate. This leads to an intense battle where Broly pushes Beerus to use his full power. Another plotline could be that Beerus hears about Broly's power and decides to test him. He travels to Broly's location and challenges him. Broly, seeing Beerus as a threat to his friends or his planet, fights back with all his might.
One possible plotline could be that Cell, seeking to prove his superiority, challenges Broly. Broly, in his usual berserk state, accepts without hesitation. The fight could start with Cell trying out his various attacks like the Kamehameha - like Solar Flare and his physical strikes. But Broly's power is just too much and he starts to overpower Cell. However, Cell then reveals a new, hidden ability that he has been developing in secret and the tables are turned for a while.
A plotline could involve Broly being sent to Kale's universe by some sort of interdimensional rift. Kale initially sees him as a threat and attacks. But as the fight progresses, they start to understand each other's power and motives. Or perhaps a fanfic could have a story where both Broly and Kale are training on the same planet. Their training methods clash, leading to a fight where they both learn from each other and grow stronger in the process.
A plotline could start with Frieza hearing about Broly's power and being jealous. He then devises a plan to ambush Broly. But Broly, being extremely perceptive in his own way, senses Frieza's approach and is ready for the fight. As the fight progresses, Frieza realizes that Broly is much stronger than he expected and has to use all his dirty tricks to try and win. Or perhaps the plotline could involve Broly being captured by Frieza's forces, and then Broly breaks free and goes on a rampage against Frieza and his minions.
The 'starless star vs the forces of evil fanfic' could be really interesting. Firstly, the concept of a 'starless star' is quite unique. It might be a symbol of something that is not as bright or obvious as a normal star, but still has great power. The 'forces of evil' could range from dark wizards to demons. The story could show how the 'starless star' forms alliances, learns new skills, and ultimately defeats the forces of evil. It might also touch on the idea of sacrifice and the cost of victory.
One interesting plotline could be when Star and Marco are dared to switch bodies for a day. It creates a lot of comical situations as they try to navigate each other's lives. Another could be a truth scenario where Star has to reveal her deepest fear about losing her magic forever. This could lead to some emotional moments between her and her friends.