Another storyline could be set in a fantasy world where Aria and Jake are from different magical races. Their pregnancy is a big deal as it could bring about a new era of peace between their races. However, there are dark forces that try to stop the baby from being born. So they have to go on an adventure to protect their unborn child, facing various magical creatures and obstacles along the way.
Another storyline could involve Kai's relationships. He could fall in love with an OC from a different tribe. This would create a lot of drama as their tribes might have some sort of feud or different values. They would have to fight against the odds to be together, and Kai might have to prove himself to her tribe to gain their acceptance.
One idea could be to focus on a new hacker character in the Watch Dogs universe created by Skymedia. This character could be an undercover agent trying to expose a powerful criminal organization from within. They would use their hacking skills to gather evidence and take down the bad guys one by one.
One idea could be to create an OC (Original Character) who has a unique multimagic ability that is related to the elements but in a different way than the existing characters in Fairytail. For example, instead of controlling fire, water, etc. directly, the OC can manipulate the energy within those elements. They could join Fairytail and face challenges that test their new abilities and their loyalty to the guild.
One idea could be to create a male OC who is a skilled mechanic. He could start off as an ordinary worker in one of the Gundam 00 facilities. But then, through a series of events, he discovers a hidden ability within himself related to the Gundam technology. Maybe he can communicate with the Gundam on a deeper level than anyone else. This could lead to him being recruited into a special team that deals with high - risk missions. He would have to face challenges not only from the enemies but also from within the team as some might be jealous of his new - found abilities.
One idea could be that the Saiyan male OC is a warrior from a different part of the Saiyan planet. He meets Kale during a universal tournament. At first, Kale is shy and reserved around him, but as they train together for the next rounds of the tournament, they start to develop feelings. The OC could teach Kale some new Saiyan fighting techniques that she hasn't seen before, which helps her gain more confidence in herself not just as a fighter, but also in her relationship with the OC.
One idea could be to have the male OC be a gamer in the real world who gets transported into the Naruto universe. He could use his gaming skills, like strategic thinking and quick reflexes, to adapt to the ninja world. For example, he might be really good at predicting opponents' moves in games, which would help him in battles against ninjas.
A possible storyline could involve Juno Eclipse leading a group of young Jedi trainees. She has to teach them the ways of the Force while also protecting them from the dark side. This could show her growth as a Jedi and leader, as she overcomes her own insecurities and past mistakes.
One idea could be to have the male OC reincarnated as a powerful shinobi from a forgotten clan. He could have unique abilities that set him apart from the regular Naruto characters. For example, he might be able to control a new type of chakra nature that no one has seen before.
One idea could be to have the Power Rangers SPD team cross over with another ranger team from a different season. They could team up to fight a common enemy that is too powerful for either team alone. For example, a new villain that has the ability to travel between dimensions and is causing chaos in both of their worlds.