An immortal OC can also impact the plot by being a source of information. Having lived through so much, they know the secrets of the past, including things about the origin of chakra or the true nature of certain clans. This knowledge can be a driving force for the main characters' quests and can completely change the narrative as they uncover things that were previously hidden.
She could change the power balance. If she's a powerful seal master, she might be able to create seals that can counter powerful jutsus of the villains. For instance, if there's a new villain with a really strong attack jutsu, she could develop a seal to nullify it.
An Immortal OC could be a mentor figure. Since they've been around for so long, they can offer unique insights and wisdom to the younger, less - experienced members of the Justice League.
First, you need to create your original character (oc). Decide on their backstory, like how they became immortal. It could be a curse, a gift from a deity, or a scientific experiment gone wrong. Then, think about their personality. Are they benevolent or more self - centered because of their immortality?
One interesting idea could be the concept of an immortal OC (original character) interacting with the well - established Naruto universe. For example, their immortality might lead to unique relationships with the mortal characters. They could have witnessed countless historical events in the Naruto world and thus possess a wealth of knowledge that others don't. This could potentially change the course of the story as they might use this knowledge to influence the actions of the main characters like Naruto or Sasuke.
The baby could add a whole new dynamic to the plot. It might become a target for villains who want to use it against Naruto. For example, if the baby inherits Naruto's unique powers, enemies could try to kidnap it to study or control those powers. Also, Naruto would have to balance his duties as a hero and a father, which could lead to some interesting internal conflicts.
Suppose the OC is extremely headstrong. In that case, they might take more risks in battles or in dealing with the Akatsuki. This could lead to different outcomes, like maybe they'd charge into a fight with Pain without waiting for backup, which would change the whole sequence of events in the story.
Perhaps the OC is experimented on by an evil organization. The Uzumaki's strong life force makes them a prime candidate. The experiments go wrong (or right, depending on how you look at it) and they end up becoming immortal. This then leads to a story of revenge as they try to take down the organization that changed them forever.
One idea could be that the immortal female OC has lived through different historical periods and uses her knowledge to solve modern-day mysteries. For example, she might have witnessed the fall of ancient civilizations and can now help archaeologists understand things that were lost to time. Another plot could involve her falling in love with a mortal and having to deal with the heartbreak that comes with outliving her lover over and over again. Or perhaps she is on a quest to find others like her, immortals who have been hiding in the world for centuries, and along the way she discovers secrets about the origin of her immortality.
The OC's gamer traits can completely change the plot. If the OC is used to strategizing in games, they might come up with new plans to deal with the Philosopher's Stone situation. For example, instead of just following the traditional methods, they could think of a more complex, multi - step plan like in a strategy game.
In terms of power levels, the Immortal Mage could have powers that are on par with the likes of Scarlet Witch or Doctor Strange. Their immortality might also come with the ability to regenerate from any injury, making them a formidable force. They could also have the power to travel through different dimensions, which is a common theme in Marvel. This would allow them to access hidden knowledge and artifacts that could be used to either protect or disrupt the Marvel Universe depending on their motives.