They could have a fight and then make up. It's a classic way to develop a relationship. Maybe Nico does something Percy doesn't like in the name of protecting him, and they argue. But then they realize they were both just trying to look out for each other and become closer.
Put them in a situation where they have to rely on each other completely, like being trapped in a magical maze. They'd have to communicate, trust each other's abilities, and support one another. Through this, their brotherly bond would strengthen as they see each other's strengths and weaknesses up close.
At first, it might be rocky. Percy is more of a laid - back hero, Nico is the quiet and often misunderstood one, and Jason is the dutiful leader type. But as they spend more time together, they start to see the good in each other. Percy might teach them how to have fun and not take everything so seriously. Nico could show them the power of the underworld and its secrets. And Jason would bring a sense of discipline and strategy to their group.
They could also develop their relationship through misunderstandings and then making up. Maybe Leo accidentally uses his powers in a way that endangers Percy. At first, Percy is angry, but then they talk it out. Leo explains that he was trying to protect Percy in his own way. This kind of communication and forgiveness would strengthen their brotherly bond.
You can start by having them share a common goal. For example, they both need to retrieve a powerful artifact that has been stolen and is being used for evil. As they search for it, they face obstacles that force them to rely on each other. This builds trust gradually.
By showing them having heart - to - heart conversations. For example, they could talk about their experiences growing up as demigods, their fears, and their hopes. This would deepen their connection.
A good way to develop their relationship is through mutual self - discovery. They could each have insecurities or secrets that the other helps them face. For instance, Percy might be struggling with his identity as a son of Poseidon and Triton could share his own experiences of growing up as a sea god's son, which would create a deeper connection between them.
In fanfiction, they could develop a relationship based on shared goals. Let's say there is a new threat to the gods and the demigods. Percy and Athena have to work together to defeat it. During this time, they learn about each other's strengths and weaknesses. Percy learns from Athena how to plan better and Athena learns from Percy how to be more adaptable in the face of unexpected situations. As they face challenges side by side, their relationship deepens.
In some fanfictions, their relationship might develop because of a common enemy. The threat of this enemy forces them to put aside any differences and work together closely. As they do this, they start to see the good in each other. Nico might see Percy's leadership skills, and Percy might see Nico's hidden strength and loyalty. They gradually become closer friends or even something more, depending on the nature of the fanfiction.
Often through shared adventures. When they are in dangerous situations together, they start to trust each other more. For example, if they are in a battle against a horde of demons, they need to watch each other's backs. This mutual reliance deepens their bond.
Well, it could start with mutual respect. For example, Percy respects Artemis's power and her role as a goddess. Artemis, in turn, could come to respect Percy's courage and his ability to survive against all odds. They could then start to work together on small tasks, like protecting a particular area from monsters. As they spend more time together, they might start to trust each other more, and their relationship could grow deeper.
A slow - burning friendship could be developed through shared experiences. Maybe they are both trapped in a strange magical realm for a while. During that time, they have to rely on each other to survive. Hera could use her powers in ways Percy has never seen before to protect them, and Percy could use his quick thinking and demigod abilities to find food and shelter. This shared struggle would bring them closer together.