There are many good ones. One type of fanfiction you might come across is the 'alternate universe' ones. In these, Robin and Zatanna could be in a completely different setting, like a high school AU (alternate universe) where they are normal teenagers dealing with normal teen problems but still end up falling in love. Another aspect that makes these fanfictions interesting is how different authors interpret the characters' personalities and how that affects their relationship.
Perhaps a jealous and power - hungry magician from Zatanna's own magic - using community. This person might feel overshadowed by Zatanna's growing power and popularity. So, they decide to kidnap her to steal her magic or to simply get her out of the way so they can be the top magic - user in their world.
One possible plot could be that Zatanna is kidnapped by a group of magic - hating villains who want to use her as a bargaining chip against the Justice League. They might hold her in a magically - sealed location, and the Young Justice team has to figure out how to break the seals and rescue her.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of Young Justice fanfictions. Just search for 'Young Justice Zatanna and Robin' in the search bar, and you'll get a bunch of results. Some of them are really well - written and explore different aspects of their relationship.
Friendship is a very common theme. Since they are both part of the Young Justice team, many fanfictions explore how they become friends and support each other through various challenges.
A really interesting one is 'Zatanna's Influence on Artemis'. In this story, Zatanna helps Artemis explore a more magical side of her skills. It's a bit of a character - development - focused fanfic that shows how their relationship can bring out new aspects of each other.
Well, it's darker. The original series has its serious moments, but the fanfiction takes it to another level. It might have more graphic and intense scenes, whether it's battles or emotional breakdowns. The tone is more somber and gritty.
His spider - sense would be a great asset. It could help him detect danger before it strikes the Young Justice team. For example, if there's an ambush by some villains, he would be able to sense it and warn the others in time. His web - slinging ability would also give the team an advantage in terms of mobility. They could reach places that are difficult to access otherwise.
They might be really surprised. Some fanfictions could show their characters in very different ways than they expect. For example, they might see relationships between characters that they never thought of in the official story. It could be both amusing and a bit strange for them.
Batman is often a very popular character. In fanfiction, he can be portrayed in different ways, like a more nurturing mentor figure to the Young Justice team or as a master strategist leading the Justice League in complex battles.