In a fanfiction, the relationship could develop through a mutual need. For example, the human is lost in the Skullcrawler's territory and is in danger from other predators. The Skullcrawler, for its part, might be injured and needs the human's help. So they form a pact of sorts. As they help each other, they start to communicate in basic ways, like using body language and simple sounds. Over time, this grows into a deeper bond where they protect each other.
The relationship can start with fear. The human sees the Skullcrawler as a terrifying monster at first. But then, through a series of events like the Skullcrawler sparing the human's life for some reason, the human begins to question their initial perception. They might start to study the Skullcrawler more closely, and as they learn about its behaviors, a sense of respect could develop.
One plot idea could be a human scientist studying Skullcrawlers in their natural habitat. The human accidentally gets separated from their team and has to rely on their wits to survive among the Skullcrawlers. Maybe they discover that the Skullcrawlers have a complex social structure that was previously unknown. Another could be a story where a human is befriended by a young Skullcrawler that is an outcast in its group. Together, they face challenges from both the Skullcrawler community and humans who fear the unknown bond between them.
It could start with fear and curiosity. The human is initially terrified of the xenomorph but as they observe it, they notice some unique behaviors. This piques their curiosity and they start to approach it cautiously.
The relationship can start with a chance encounter. Maybe the human stumbles upon an injured Glaceon and decides to help it. From there, trust begins to build as Glaceon realizes the human's good intentions. They can then start to communicate, even if it's in a simple way like understanding each other's body language. As they spend more time together, they learn about each other's likes and dislikes, which deepens their bond.
In fanfiction, the relationship can be developed through a series of events. The human might be a Pokémon trainer who has a special ability to communicate with Pokémon on a deeper level. When they encounter the female Rayquaza, they are initially cautious but intrigued. As they interact more, the human might offer the Rayquaza something it desires, like a special berry or a place to rest. This exchange leads to more interactions, and gradually, they form a relationship. The human could also introduce the Rayquaza to human concepts like friendship and loyalty, which are new to the Rayquaza, and in turn, the Rayquaza could show the human the wonders of the Pokémon world from its perspective.
Another approach is through a shared goal. Imagine both the yeti and the human are being chased by a common enemy, like an evil wizard who wants to capture the yeti for its magic and the human for some dark ritual. They have to rely on each other's strengths. The yeti's physical power and the human's intelligence work together to outwit the wizard. During this adventure, they come to understand each other's value and a strong relationship blossoms.
First, they need to start with some common ground, like a shared goal or a mutual enemy. This gives them a reason to interact. Then, they can gradually learn about each other's cultures. For example, the human can learn about the Khajiit's moon - based beliefs, and the Khajiit can understand human social hierarchies.
They could start by trading Pokémon - related stories. The male human might tell Ash about his first encounter with Pikachu, and Ash could share his own adventures. As they talk more, they find common ground and start to respect each other. Then, when they face a common enemy, like a Team Rocket - like organization trying to steal Pikachu, their relationship evolves into a strong friendship.
The relationship can be developed through mutual need. For example, if the human is lost in the dinosaur's territory, the T - Rex could initially see the human as prey but then realize the human has some unique skills, like making fire or using tools. This could lead to a truce. Or if the T - Rex is injured, the human could use their medical knowledge (assuming some sort of knowledge transfer in the story) to help the T - Rex, and in return, the T - Rex protects the human from other threats.
The relationship could develop through shared dreams. Isabelle and the human start having the same strange dreams every night. At first, they are confused, but as they start to communicate about these dreams, they find a deep connection. This unique way of communication could be the starting point of a very special relationship.
Communication is key. If in the fanfiction there is a way for the human and the monster to communicate, either through telepathy or some other means, they can start to understand each other's motives and desires. For instance, the monster might be lonely and the human might be curious, and this can form the basis of a relationship.