A cool fanfiction idea might be that there is a hidden connection between the magic in the Young Justice universe and the power of Ghost Rider. A young mage in Young Justice discovers this link and tries to summon Ghost Rider for help. But things go wrong, and instead, they end up bonding in an unexpected way, and together they face a new enemy that is using the chaos of their connection to cause havoc.
One idea could be a crossover where Ghost Rider teams up with the Young Justice team to fight a powerful demonic threat that neither could handle alone. Maybe they have to enter the underworld to stop a demon lord from opening a portal to Earth. Another idea is a story where a member of Young Justice is somehow cursed and starts to transform into a Ghost Rider - like figure, and they have to learn to control this new power while still being part of the team.
One idea could be that Ghost Rider somehow gets transported into the Young Justice universe. He might initially be seen as a threat by the team. But then they realize he's fighting against a common evil that has ties to the dark forces in both their worlds. For example, a demon that is trying to open a portal to bring more chaos.
One idea could be that Ghost Rider's powers are somehow needed to stop a demonic threat in the Young Justice universe. Maybe a powerful demon is causing chaos and the team realizes they need the unique abilities of Ghost Rider to send it back to hell. Another plot could involve a member of Young Justice being possessed and Ghost Rider having to help exorcise the demon while also teaching the team about the darker, supernatural side of their world.
Ghost Rider could be a wildcard in Young Justice fanfiction. He might show up to deal with a threat that the team can't handle on their own. His abilities would make him a force to be reckoned with.
In Young Justice fanfiction, if Ghost Rider were to be introduced, it would change the dynamics completely. His presence would likely draw out the villains who are interested in his power or are afraid of it. The Young Justice team would have to learn to work with someone who has a very different moral code and a power source that is based on vengeance. This could lead to some really intense storylines where the team has to decide how far they are willing to go to protect the world with the help of Ghost Rider.
In a fanfiction, the Ghost Rider could form an alliance with Batman. Batman would be intrigued by the supernatural element that Ghost Rider brings. They could team up to take on villains who are using magic or other dark forces. Ghost Rider's powers of hellfire and his unearthly strength would be a great asset to the Dark Knight's strategic mind.
One idea could be that the Ghost Girl is actually a lost hero from another dimension. She has special powers that she doesn't fully understand and the Young Justice team has to help her control them while also trying to figure out how to send her back home. Another plot could involve the Ghost Girl being a spirit who is tied to a mystery that the team needs to solve. Maybe she was a victim of an old, forgotten experiment and her presence is a clue to stopping a new threat related to that experiment.
An interesting OC could be a street artist. They have a unique connection to the spirit world through their art. One day, while creating a mural inspired by the Ghost Rider, they are possessed by the spirit and become a new kind of Ghost Rider, using their art to fight evil.
One interesting idea could be a crossover of the Ghost Rider's powers with Naruto's ninja abilities. For example, Naruto might gain the ability to use the Ghost Rider's chain attacks in his combat style. It could also explore how the two different worlds' moral and ethical concepts interact when these two characters' stories merge.
I think Superboy could be really interesting. He has that inner struggle with his identity and being part of the world, and Ghost Rider's dark and complex nature could add another layer to that. They could have some really intense scenes together as they both deal with their own forms of power and the consequences of it.
One idea could be a crossover where the Young Justice team has to team up with the Justice League to face an interdimensional threat. Maybe a powerful villain from another dimension is trying to invade Earth and the combined skills and powers of both groups are needed to stop it.