Well, in the story, their relationship could start with Adam being a bit afraid of Beetlejuice. But as Beetlejuice shows his softer side, like when he helps Adam deal with his past regrets from his living days, Adam begins to warm up to him. They could also develop their relationship by collaborating on a project, like redecorating a spooky old house in the afterlife. As they work side by side, they learn more about each other's personalities and quirks. Additionally, they might have a moment where they save each other's lives, which deepens their bond.
In the fanfiction, a possible plot could be that Beetlejuice has a bet with another character that he can make Adam do something really out of character, like break a major rule in the afterlife. As Beetlejuice tries to get Adam to do this, Adam starts to learn more about himself and his own capabilities. Another idea is that there is a magical object in the musical world that Beetlejuice and Adam both want for different reasons. They start off as rivals for it but then realize they can achieve more by working together. And, there could be a plot where Adam gets lost in a strange part of the afterlife and Beetlejuice has to find him, during which they both grow as characters.
The contrast between their personalities. Beetlejuice is brash and unpredictable while Adam is calm and gentle. This contrast creates a lot of room for interesting interactions and character development in fanfiction.
Their relationship could be developed by having them face a common enemy. For example, a more powerful and malevolent spirit that threatens both the afterlife and the human world. This would force them to rely on each other more and understand each other's strengths and weaknesses. They could also develop a deeper relationship through shared interests. Maybe Lydia shows Beetlejuice her love for art, and he in turn shows her some of the more interesting and spooky aspects of the afterlife that she hasn't seen yet.
One great aspect of Beetlejuice and Adam fanfiction is the exploration of their unique relationship. Writers can delve into how Adam, being the more reserved of the two, reacts to Beetlejuice's wild antics. It could be a story where they form an unlikely friendship in the afterlife, with Beetlejuice teaching Adam to be more carefree and Adam teaching Beetlejuice some sense of propriety.
Their relationship could be characterized as a clash of the old and the new. Lucifer represents the ancient, rebellious celestial being, while Adam is the new creation. It could be a relationship full of tension as they come from such different worlds.
Their relationship can be developed by showing small, everyday interactions. For example, sharing a meal and chatting about their day in the clan. This would build a sense of closeness and familiarity.
Their relationship can be developed through shared experiences. For example, if they face a common enemy together. This would force them to rely on each other, communicate, and understand each other's strengths and weaknesses. In the heat of battle, they might develop a mutual respect that blossoms into a deeper friendship.
You can develop their relationship further by adding more challenges. For instance, introduce a character who is jealous of their relationship and tries to drive them apart. This could test their love and loyalty to each other. They would then have to fight for their relationship, which would strengthen their bond in the end.
Their relationship can develop through shared experiences. For example, if they are trapped in a dangerous dungeon together, they have to rely on each other to escape. This builds trust between them.
They could develop their relationship through shared experiences. Maybe they both have a connection to a certain magical element. Discovering this connection could lead to them opening up to each other. For example, if they both have an affinity for a rare type of energy, they could explore how to use it together, which would bring them closer. This would also allow them to learn more about each other's pasts and what made them who they are.