A good plot idea might involve Artemis getting kidnapped. Green Arrow then has to track her down, using all his skills and resources. Along the way, he discovers some secrets about Artemis' past that she has been hiding from him. Or perhaps a plot where they are both framed for a crime they didn't commit. They have to work together to clear their names, while also dealing with other superheroes who think they are guilty.
One great Young Justice Green Arrow fanfiction is 'Green Arrow's Legacy'. It focuses on Green Arrow mentoring a young archer in the Young Justice team. The story is full of action and character development.
Their relationship can be developed by having them face more personal challenges together. For example, if one of them gets injured badly, the other has to take care of them. This can show a deeper level of care and dependence. Also, they could have more heart - to - heart conversations about their fears and dreams. Maybe Artemis reveals her insecurities about living up to Green Arrow's standards, and he reassures her.
Maybe Artemis's sister is an undercover agent in an enemy organization. She has to balance her loyalty to her sister and her mission. She could send coded messages to Artemis, and Artemis has to figure out what they mean. This would add a lot of mystery and tension to the fanfiction.
One great storyline could be about Red Arrow and Artemis going on a solo mission together. They face a powerful villain who has the ability to manipulate minds. As they battle, they have to constantly question what's real and what's not. This tests their trust in each other and their own mental strength.
A plot could involve Arsenal getting injured during a mission, and Red Arrow has to take care of him. During this time, they have deep conversations about their lives as heroes, their families, and their place in the Young Justice team. It could lead to a stronger bond between them and a new understanding of each other.
One idea could be that Red Arrow and Cheshire are forced to team up to stop a greater evil. They start off distrusting each other but as they face challenges, they begin to understand and respect one another. Another could be a story where Red Arrow has to rescue Cheshire from a powerful enemy, which makes her question her own motives and alliances. Maybe a plot where they are both on opposite sides in a battle but end up protecting each other from unexpected threats.
Perhaps a story where a Green Lantern ring chooses an unexpected candidate in the Young Justice universe. This person might not have the typical 'hero' qualities at first. They then have to prove themselves not only to the Green Lantern Corps but also to the Young Justice team while dealing with the newfound power and responsibility.
One idea could be that Robin and Artemis are on a solo mission together and get trapped in a strange, magical place. As they try to find a way out, their feelings for each other intensify. Another could be a post - battle scenario where they're both injured and have to rely on each other for care, leading to some romantic moments. Or perhaps a time - travel plot where they see alternate versions of themselves in different relationships and it makes them realize their feelings for one another.
One idea could be Naruto finding himself in the Young Justice universe and teaming up with Artemis. Maybe they go on a mission to stop a new villain who has the power to manipulate time. Naruto's unique jutsu could be a great asset in combat against this villain.
Maybe a story where Icicle Jr has a change of heart and tries to defect from his villainous group. Artemis is initially skeptical but decides to help him. Along the way, they have to evade capture from both the villains and some overzealous heroes who don't trust Icicle Jr's intentions. This could lead to some intense action scenes and character development for both of them.