Another way is to show it as a relationship full of tension. They don't trust each other completely but they know that they need each other for certain goals. For instance, they might be collaborating on a project to spread more fear in the world, but each is secretly planning to double - cross the other when the time is right.
Maybe they start as rivals, constantly trying to outdo each other in terms of scaring mortals. But then they realize that together they can create a much more terrifying world. So they start working together, with Zalgo spreading madness and Slenderman preying on the fearful minds.
Their relationship could develop through shared experiences. For example, if they both get caught in a trap set by a third party, they have to rely on each other to escape. This would force them to communicate and start to understand each other.
Another way is to portray it as a complex relationship filled with envy. Poseidon might envy Zeus's position as the king of the gods, while Zeus could be envious of Poseidon's power over the vast oceans. This envy could lead to various power struggles and tense moments between them in the fanfiction.
The relationship can also be portrayed as a mentorship of sorts. Hermes, being the younger god, could look up to Apollo in certain aspects like art and prophecy. He might ask Apollo for advice on how to create beautiful melodies (even though Hermes is more known for his flute). Apollo, in turn, could be impressed by Hermes' quick thinking and ability to get out of tight situations, and learn from him in terms of adaptability. This dynamic would add an interesting layer to their relationship in fanfiction.
It can be portrayed as a mentorship of sorts. Konan, with her more mature and composed nature, could guide Sasuke in certain aspects like controlling his emotions better. Since Sasuke has a tendency to be impulsive at times, Konan's wisdom could be a great help to him.
Well, in many fanfictions, their relationship can vary greatly. It could be that they are rivals, vying for control over certain areas or for the loyalty of other Creepypasta characters. Their different personalities, Splendorman's more flamboyant and friendly nature against Slenderman's silent and often intimidating presence, make for a lot of potential plot twists.
There are also fanfictions that take a completely different turn and show a sort of begrudging respect between them. After a series of events where they both learn more about each other's pasts and motives, they start to respect the other's power and tenacity. This might not lead to friendship, but it does create a more nuanced relationship than just pure hatred.
It can be shown through Itachi's actions. For example, he might not allow other characters to get too close to Sakura. He could give warning looks or subtly use his power to keep others at bay.
The relationship could be shown as a mentorship of sorts in fanfiction. The Dark Avatar, having a different perspective on power and the spirit world, could teach Korra things she never knew. At the same time, Korra could try to reform the Dark Avatar. It would be a complex relationship full of give - and - take, with both characters growing in different ways. For example, the Dark Avatar might learn about compassion from Korra, while Korra could learn about the hidden aspects of the spirit world from the Dark Avatar.
In fanfiction, Laufey could be portrayed as a protective figure in a very unique way. Since baby Loki is in a vulnerable state, Laufey's spirit or some magical essence of him could be guiding Loki, shielding him from harm in Asgard. It could be a silent, behind - the - scenes kind of protection. And as Loki grows, he starts to sense this protection and becomes curious about the source, which is Laufey.