Perhaps Wally returns and discovers that the Young Justice Outsiders have a new mission that he's not fully aware of. He tries to fit in and contribute, but there are some members who are skeptical of him because of his long absence. As he works to prove himself, he uncovers a conspiracy within the team that is putting them all in danger. He then has to use his skills and knowledge to expose the conspiracy and save his friends.
In a 'Young Justice Outsiders Wally Returns' fanfiction, he might return as a changed person. He could have lost his memories while away and slowly regain them as he interacts with his old friends. His return could also bring back old threats that were thought to be gone. For example, an enemy from his past might resurface, believing that Wally holds the key to something they want.
It could be a new villain who has a vendetta against speedsters. Since Wally is a speedster, this villain might see his return as an opportunity to prove himself. Maybe he's a scientist who has developed a weapon specifically designed to counter speedsters' abilities.
Maybe Wally returns with new superpowers. He could surprise his old friends in Young Justice and they all go on a new mission together.
Well, it could be that Wally returns with new superpowers. Maybe he was in some sort of time - warp or alternate dimension and comes back stronger. He might have to prove himself to the team again that he's still the same Wally they knew.
Maybe a villain from the dimension where Wally has been. This villain could have followed Wally back to seek revenge or to take over the world that Wally has come back to. Since Wally has some knowledge about this villain, it would be his responsibility to stop the villain and protect his friends and the world. The villain might have powers that are a match for Wally's, making it a really tough fight.
One idea could be that when Wally returns, he has new superpowers. Maybe he gained the ability to manipulate time during his time away, which he has to learn to control. This could add a whole new dynamic to the team as they deal with the implications of such a powerful ability.
Wally could be developed by showing his growth in character. For example, if he was a bit cocky before, he could return more humble and with a deeper understanding of the world. This change could be a result of his experiences while he was away.
They could be in a parallel universe where the rules of their relationship are different. In this universe, they are more open about their feelings from the start. They go on a date to a beautiful place, like a beach at sunset. As the sun goes down and the sky is painted with warm colors, they share a tender kiss, realizing how much they mean to each other.
In a Young Justice fanfiction where Wally and Zatanna date, they might have some really cute and exciting adventures. They could use their respective powers to help each other out. For example, Wally's super - speed could be useful in getting Zatanna out of a tight spot quickly. And Zatanna's magic could be used to create some fun or romantic scenarios for them. Maybe they go on a date to a magical realm that Zatanna discovers, and Wally has to use his speed to keep up with all the strange and wonderful things there. It would be a great combination of their two different worlds coming together in the fanfiction.
A great plot for Young Justice Outsiders fanfiction could involve a crossover with another DC team or universe. Maybe the Outsiders accidentally end up in an alternate dimension where they have to team up with unlikely allies to get back home. This would introduce new dynamics and challenges for the characters.
One idea could be an OC with a unique power, like the ability to manipulate sound waves. They could join the Outsiders and use their power in unexpected ways during battles, for example, creating sonic illusions to confuse enemies. Another plot could involve an OC who is from a different dimension and has to adapt to the Young Justice Outsiders' world while also bringing some of their own world's knowledge and technology. Or perhaps an OC who has a personal vendetta against a villain that the Outsiders are also after, and they initially clash with the team but then learn to work together.