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 plot idea could be that they are undercover on a mission as a couple. As they get into character, they end up having a real moment and kiss. This kiss then makes them question their true feelings for each other.
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.
A 'lemon' in fanfiction often refers to a story with romantic or sexual undertones. In the context of Artemis in Young Justice fanfiction, it could explore a more mature relationship for her character. Maybe it delves into a romantic relationship she has within the team, with a lot of emotional and physical intimacy described in a tasteful way.
One interesting fanfiction could be where Robin and Artemis go on a secret mission together outside of the team's knowledge. They face a powerful new villain and have to rely on each other's skills more than ever. Their relationship deepens as they work through the challenges, with Robin using his detective skills and Artemis her archery and combat expertise.
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.
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.
One idea could be that Robin is on a solo mission in Gotham and crosses paths with Catwoman. She initially tries to mislead him, but he sees through her tricks. They end up teaming up briefly to take down a mutual enemy who is stealing valuable artifacts from both the Batcave and Catwoman's hideouts.
Maybe in the fanfiction, the harem members are all from different backgrounds within the Young Justice universe. They are brought together by their feelings for Robin. Some are heroes, some are civilians with special knowledge. Their relationships develop as they help Robin solve a mystery that threatens the entire Young Justice world. This would involve a lot of character exploration and relationship building.
One idea could be that Robin is on a solo mission and Deathstroke is hired to stop him. Robin has to use his wits and agility to outmaneuver Deathstroke's superior strength and experience. Another could be that Deathstroke, for some reason, decides to train Robin secretly, leading to a complex relationship between the two where Robin is conflicted about learning from an enemy.
A great plot could involve Robin getting injured and Cirel having to take care of him. During this time, they have deep conversations and start to understand each other on a more personal level. This could lead to a stronger bond between them in the fanfiction.