Maybe an OC who is an inventor. They create all kinds of new gadgets for the Storm Hawks. But there's a catch. The Cyclonians find out about this OC and try to kidnap them to use their skills for their own evil purposes. The Storm Hawks then have to rescue the OC and protect their new inventions from falling into the wrong hands.
An interesting plot could involve an OC who is from a long - lost tribe related to the Storm Hawks' world. This OC brings with them ancient knowledge and powers that could either help or endanger the Storm Hawks, depending on how they choose to use it. They might have to figure out how to integrate this new element into their fight against the Cyclonians.
One interesting Storm Hawks fanfiction could be about the adventures of the team in uncharted skies. Maybe they discover a new type of crystal that gives their ships enhanced powers. Another could be a story where they have to team up with their former enemies to face a greater threat.
One interesting storyline could be Piper trying to understand Dark Ace's motives. Maybe she discovers that he has a past trauma that led him to be on the 'evil' side. This could create a complex relationship where Piper wants to help him change.
One possible plot could be that Aerrow and Piper go on a secret mission together. They face many challenges along the way, like dealing with a new and powerful enemy. Their relationship could deepen as they rely on each other's skills. Piper uses her intelligence to outwit the foes, and Aerrow uses his leadership and combat skills to keep them safe.
Another interesting plot might involve a new and unique jutsu being created by a character. This jutsu could change the power dynamics in battles and force characters to adapt their strategies. It could also lead to a whole new arc of the story where characters are trying to either master this jutsu or find a way to counter it.
One plot idea could be a story where the characters from Twilight are caught in a quiet storm that has magical properties. Maybe it makes their powers go haywire. For example, Edward's mind - reading ability becomes uncontrollable and he has to deal with an overwhelming influx of thoughts. Another idea is that the quiet storm is a sign of an approaching ancient evil, and the Twilight characters have to team up with some new, mysterious characters to face it.
One idea could be that they face a powerful new mutant threat together as a married couple. Their combined skills, Wolverine's combat abilities and Storm's power over the weather, make them a formidable team against the enemy.
One interesting interaction could be when Aerrow and Piper have an argument. Maybe it's about a strategic decision during a mission. Their different personalities clash, but this also shows their passion for the cause. Later, they make up and learn from each other.
Give them a distinct appearance. For example, if they're a bird - like creature, give them unique feather patterns or colors that no one else has. This will make them stand out visually.
Another plot could revolve around an OC who is a Spartan trainee that doesn't quite fit the mold. They have a different way of thinking and approaching combat. In Halo 4, they end up being the key to solving a mystery related to the Prometheans. Maybe they find a way to communicate with the Prometheans and convince some of them to stop fighting the humans.
One idea could be an Otsutsuki OC who comes to Earth not for conquest but to study the unique life forms here. They could befriend some of the local ninjas and learn about the concept of friendship, which is alien to the Otsutsuki. This would lead to a series of adventures where they have to protect their new friends from other more hostile Otsutsuki members.