Another way is to put them in a situation where they have to protect each other. Let's say they are trapped in a magical dimension where only one of them has powers at a time. When Superboy loses his powers, Wonder Girl has to protect him. And when her powers are nullified, Superboy steps up. This experience of depending on each other for survival can make their relationship more complex and deep - rooted.
You could also develop their relationship through personal growth. Suppose Superboy is learning about his Kryptonian heritage and Wonder Girl is training to be a better leader. They can support each other in these individual quests. Wonder Girl could help Superboy understand the values of his heritage, and in return, Superboy can give her advice on leadership based on his own experiences. This mutual support would deepen their relationship.
Their relationship can be developed through shared experiences. For example, if they are on a dangerous mission and have to rely on each other to survive. Superboy could use his strength to protect Zatanna from physical threats, while Zatanna uses her magic to get them out of tricky situations. Another way is through communication. They could start by having small conversations about their different worlds, Superboy's Kryptonian heritage and Zatanna's magical upbringing. This would lead to a deeper understanding and respect for each other, gradually developing their relationship.
In fanfiction, Wonder Girl can be developed through her interactions with new characters. For instance, if she meets a magic - using character, she could learn about different forms of power and how to incorporate them into her own combat techniques. This would expand her abilities and show her adaptability.
Their relationship can be developed through shared secrets. For instance, they could both discover something about the League that they're not supposed to know. Keeping this secret between them would bring them closer.
Their relationship can be developed through shared experiences. For example, going through a tough battle side by side where they both have to save each other's lives. This would create a bond of trust between them.
They could start by respecting each other's skills. Robin admires Wonder Woman's strength and she respects his intelligence. They could have shared training sessions where they exchange tips and grow closer. For example, Robin teaches Wonder Woman some new ways to analyze battle strategies quickly.
Another plot could be a time - travel adventure. Maybe a powerful magic spell goes wrong and sends them back in time. There, they meet younger versions of the Justice League members. They have to figure out how to get back to their own time while also making sure they don't accidentally change the future in a bad way. This would involve a lot of action and also some interesting character interactions as they see the heroes they know in a different light.
Their relationship also has the potential to be a mentorship of sorts. Superboy, having been part of the hero world longer, can offer advice to Static on dealing with the media and public perception. Static can show Superboy how to better connect with the civilian population, as he has more experience on the streets.
It could start with mutual respect on the battlefield. As they fight side by side more often, they begin to trust each other. This trust could then turn into a friendship, and eventually, they might develop romantic feelings. For example, Arsenal might start to notice little things about Wonder Girl, like how she always encourages the team, and that could make him see her in a different light.
In fanfiction, Superboy and Wonder Girl could have a very dynamic relationship. They might team up to fight powerful villains. Their powers complement each other well, with Superboy having super strength and other Kryptonian abilities, and Wonder Girl having her own set of Amazonian powers. Their relationship could be one of mutual respect and admiration as they learn from each other's different fighting styles and ways of approaching challenges.
Their relationship can be developed through shared challenges. For example, when they are stuck in a difficult situation like being trapped in an enemy's lair. They have to communicate, trust each other, and use their combined skills to escape. This would strengthen their bond.