They could interact more casually. In the original series, there are often battles and serious missions. But at a party, they might just joke around and share funny stories. For example, Gajeel and Natsu could have a friendly competition about who can eat the most food at the party instead of fighting over something serious.
At a party in fanfiction, characters might form unexpected alliances or friendships. Maybe a shy character like Levy could become really close friends with a more outgoing character like Cana during a party. They could bond over things like card games or sharing secrets. Also, characters who usually have a professional relationship, like Makarov and the council members, could interact in a more relaxed, party - like atmosphere, chatting about non - guild - related things like their hobbies.
Merlin in fanfiction may also have different relationships. She could be closer friends with certain characters or have a romantic interest in someone unexpected. For instance, she might form a strong bond with a minor character from the series, which then changes the whole dynamic of the story.
In fanfiction, Erza might be developed to show more vulnerability. While in the original series she is very strong and stoic, in fanfiction she could be shown to have moments of self - doubt, especially when it comes to her relationships with her guildmates like Lucy. For example, she might worry that her strict nature pushes Lucy away.
In fanfiction, the characters of Erza and Jellal can be developed in ways that deviate from the original series for the sake of exploring new relationship dynamics. For example, Erza could be depicted as more of a risk - taker when it comes to her relationship with Jellal. She might be willing to go against the guild's rules or norms to be with him. Jellal could be developed as having a different set of moral values in relation to Erza. Maybe he is more lenient or strict depending on how the author wants to shape their relationship. This is different from the original where their characters are more firmly set within the framework of the main story's plot and moral compass.
The Fairy Tail guild as a whole could work together. They could use their combined magic to create a powerful spell. For example, they could combine the elements of fire, ice, wind, etc. to create a spell that might be able to hold Deathwing back or even send him back to his own realm. They would need to communicate and coordinate well, which would be a challenge given the different personalities in the guild.
They can interact through virtual avatars. For example, Harry could have an avatar that has special abilities in the virtual world like flying faster than his normal self. Hermione might be able to access virtual libraries with more ancient and forbidden knowledge.
Another way is if a Fairy Tail mage visits the My Hero Academia world. Let's say Gray. He could use his ice - make magic to help in rescue operations during a villain attack. And in the process, he could teach some of the students about the importance of controlling their powers and how magic works in his world, which would be a great opportunity for cultural exchange between the two universes.
In a 'Fairy Tail in Real World' fanfiction, the characters' interactions with the environment can be really diverse. Erza could mistake a large building for a castle and try to storm it thinking it's an enemy stronghold. Happy might get excited about all the fish in a real - world aquarium. And Juvia could be constantly causing rain in dry areas because she's so used to her water - based powers being tied to her emotions in the Fairy Tail world.
Bardock would probably be initially cautious around the Fairy Tail characters. Given his Saiyan nature, he is used to a more cut - throat and survival - based environment. But as he gets to know them, he would start to respect their loyalty and sense of family. For example, he might be impressed by how the guild members always have each other's backs, much like how Saiyans rely on their comrades in battle.
Goku would likely interact with Natsu in an interesting way. They both love to fight and are always looking for a strong opponent. They might start off as rivals and then become friends. Goku would also probably be friendly with Lucy, being intrigued by her celestial spirit magic.
The characters would likely start off being cautious of each other. For instance, the devils in Highschool DxD might be wary of the mages from Fairy Tail as they have different power sources. However, as they get to know each other, they could start to learn from one another. Gray could teach some of the Highschool DxD characters about his ice - making skills, while Issei could show the Fairy Tail members some of his unique devil techniques.