One idea could be Goku arriving in the Young Justice universe due to a rift in space - time. He could initially be confused but quickly adapt and start training the young heroes, sharing his Saiyan techniques like the Kaio - ken.
Perhaps Goku is summoned by the Justice League to help against a powerful new threat that the Young Justice team is also involved in. He might form an unlikely bond with some of the members, like Superboy, teaching him about pushing his limits.
A cool fanfiction concept could be that Goku is reincarnated in the Young Justice world. He retains his fighting spirit but has to learn about the different powers and politics in this new universe while also teaming up with the young heroes on various missions.
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.
Maybe a story where some of the younger members of the Young Justice team are frustrated with the Justice League's methods and decide to take on a mission on their own, but end up getting in over their heads and have to call in the League for help. This could lead to a lot of character development and some interesting dynamics between the two groups.
One idea could be exploring new character backstories. For example, you could delve deeper into the origin of a less - known character in the Young Justice Z universe. Maybe they have a hidden power or a tragic past that has yet to be fully explored in the existing canon.
A cool Young Justice gamer fanfiction could revolve around a game tournament. The heroes participate in a high - stakes gaming competition where the loser has to face some sort of consequence in the real world. This could lead to intense rivalries and strategic gameplay within the story. Also, a story where the team discovers a hidden game level that holds secrets about their past or future could be really engaging.
One idea could be a time - travel fanfiction. The Young Justice Team gets sent back in time to the early days of the Justice League. They have to work in secret to fix a disruption in the timeline without being detected by their heroes - in - training selves. This would create a lot of interesting scenarios where they see the origin of the League and try to blend in while on their mission.
One interesting idea could be the role reversals in relationships. For example, if in the original a male character was the leader, in the genderbend fanfiction, a female character might take on that role. This can lead to new power dynamics and character interactions.
One idea could be exploring the backstories of the lesser - known members in more depth. For example, you could focus on a character like Blue Beetle and his struggle to control the Scarab while also fitting into the team. Another idea is to create an alternate universe where the Justice League is evil and the Young Justice League has to oppose them. This would lead to some really intense battles and moral dilemmas for the young heroes.
One idea could be a crossover where characters from Arrowverse and Young Justice have to team up to stop a multiverse - threatening villain. For example, Green Arrow and Nightwing leading the combined forces.
One idea could be that the Young Justice team gets accidentally transported to an alternate dimension where the Justice League has turned evil. The Young Justice members then have to figure out how to reverse the situation while also evading capture from their once - heroes. Another could be a time - travel plot where the Young Justice team travels back in time and teams up with the early days of the Justice League to stop a threat that was thought to be long gone but has resurfaced in their own time. A third idea is that a powerful new villain emerges who can only be defeated by a combined effort of the Young Justice and Justice League, but first they have to overcome their differences in fighting styles and leadership.
One idea could be a misunderstanding that leads to a battle. Maybe a villain manipulates the situation so that Young Justice thinks the Justice League has turned evil. For example, the villain uses mind - control technology on some of the League members and Young Justice has to fight to save them.