Often, their interaction is full of unspoken words. Felix may have a hidden agenda, while Adrien is just trying to be friendly. They could end up in a sort of power struggle, each trying to assert their own identity. But as the story progresses, they could start to respect each other more and find common ground.
In fanfiction, when Felix and Adrien meet, they might initially be a bit cold towards each other. Since Felix has his own complex personality. Maybe there would be some tension as they try to figure out their relationship. For example, Felix could be jealous of Adrien's life with his friends and family.
They might interact with a great deal of suspicion. The Dursleys would be suspicious of the Grangers because they are Hermione's parents and are associated with the wizarding world that they despise. The Grangers could be suspicious of the Dursleys' behavior towards Harry. So, their initial meeting might be full of cold stares and curt exchanges.
They might interact with a mix of caution and boldness. Harry, out of habit, would be cautious not to upset the Dursleys too much. Ginny, though, could be bold. For example, she might directly ask Vernon why he's so against magic when it can do so many wonderful things. Harry would be in the middle, trying to translate the Muggle - magic misunderstandings between them.
Often, their interactions are full of tension. Since the Volturi and the Cullens have a complex relationship, Felix and Bella are on opposite sides at first. However, in some stories, Bella's kindness towards Felix, despite his fearsome reputation, can start to change his perception of her. He may start to see her as an individual rather than just a part of the Cullen clan, leading to more positive interactions.
They might interact with suspicion at first. The Black family may be wary of the Marauders' Gryffindor ways and their more liberal views. Sirius would be the link between the two groups. He could try to ease the tension, but it might not be easy. Some of the Marauders like Remus might be more reserved in the interaction, while James and Sirius could be more confrontational if the Black family members start spouting pure - blood nonsense.
When they meet for the first time in fanfiction, Sonic could be running from Dr. Eggman and accidentally runs into Tails' hiding place. Tails is scared at first, but Sonic quickly reassures him. They start talking, and Sonic is amazed by Tails' intelligence and his ability to build things. Tails is inspired by Sonic's courage and they become friends right away, sharing their goals of stopping Dr. Eggman.
Adrien in fanfiction is often the sweet, kind-hearted model who is also a superhero. He's the boy next door type. Felix, on the other hand, is usually characterized as more of an enigma. He may be more calculating and less open than Adrien.
When Yelena meets the Avengers in fanfiction, her interaction depends on the writer's take. She could be standoffish, having been trained in a different way than the Avengers. However, she may also be drawn to their sense of justice. She might start by observing them from a distance. As she gets closer, she could offer her unique skills to help with a mission. Her interactions could range from tense exchanges with the more serious Avengers like Thor, to more light - hearted banter with the likes of Star - Lord if he's part of the group. It's all about how the fanfiction writer wants to develop their relationship.
With Nino, Adrien has a great friendship. Chloe might see Nino as just another one of Adrien's 'lesser' friends. In fanfiction, Nino could try to get Adrien to see Chloe's true nature, but Adrien is too trusting and gives Chloe the benefit of the doubt.
Felix and Oswald interact in a rather complex way. They often start off on the wrong foot. Felix might be more cautious and reserved, while Oswald could be more impulsive. For instance, Oswald might rush into a situation in the ink - filled corridors, and Felix would be hesitant, causing some tension between them.