An interesting plot could involve an OC who is a super - genius inventor. This OC creates some amazing gadgets that the Thundermans initially don't trust but then realize are really useful in fighting a tech - savvy villain. Also, an OC with the power of invisibility could befriend the Thundermans and help them spy on the villains, leading to some really exciting undercover adventures.
One idea could be a time - travel plot where a character goes back in time and accidentally changes something in the Thundermans' family history. Another could be a story where one of the Thundermans has to go undercover in a villain's lair to stop a big plan. Or perhaps a story about a new superpower emerging within the family that causes some chaos at first but then helps them in a big way.
One idea could be exploring what would happen if the Thundermans lost their powers permanently. It would completely change their dynamic and how they interact with the world and villains.
One idea could be a story where the Thundermans have to team up with their arch - enemies to face a new, more powerful threat. Maybe a super - villain from another dimension arrives and their combined powers are the only way to stop it.
One idea could be a crossover where the characters from both shows team up to fight a common enemy. Maybe a super - villain that is too powerful for either group alone.
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.
One idea could be an OC who is a long - lost relative of Moana. This OC could have been separated from the family during a great storm years ago. They could have unique skills, like being able to communicate with a different type of sea creature that Moana has never encountered. This would bring new adventures as Moana and the OC try to figure out how this new discovery could help their island.
One idea could be exploring the origin of the OC in the covenant world. Maybe they have a special power that sets them apart from the regular covenant members.
One idea could be an OC who is a new Wolfblood in a pack and has to prove themselves. Maybe they have a unique power that the others don't have and they have to learn how to control it while fitting into the pack's hierarchy.
One idea could be an OC who is a long - lost relative of one of the main characters. They suddenly show up and cause a stir in the power dynamics. For example, if they are related to the main heir, they might have a claim to the inheritance as well, leading to all kinds of family drama and power struggles.