The 'training together' trope is quite common. Since they are both aiming to improve their abilities, fanfic writers often depict them training side by side. This not only helps them grow stronger but also deepens their bond. There's also the 'sharing secrets' trope. As their friendship develops, they might start sharing their personal insecurities and secrets with each other, which is a big step in their relationship.
One popular trope is the 'rival - turned - friends' concept. At first, Bakugo's aggressive nature might make him seem like a rival to Kirishima, but as they get to know each other better, they become close friends. Another is the 'protective' trope. Kirishima might be shown as being protective of Bakugo, especially when Bakugo's temper gets him into trouble. And vice versa, Bakugo could be protective of Kirishima in dangerous situations.
One possible analysis could be that their relationship in fanfic often showcases a strong bond of friendship. Bakugo's explosive personality and Kirishima's more stable and friendly nature create an interesting dynamic. Fanfic writers may explore how they support each other during battles or in their daily lives at school. For example, Kirishima might be the one to calm Bakugo down when he gets too riled up, and Bakugo could inspire Kirishima to be more confident in his abilities.
Such fanfics are inappropriate. Fanfiction should focus on positive aspects like friendship, adventure, or character development. Sexualizing characters in this way can create an uncomfortable and unwholesome environment within the fan community. It may also violate the terms of use of the platform where it is posted if it contains explicit content.
In the manga, Bakugo and Kirishima don't get together romantically. They have a strong friendship based on mutual respect and shared experiences in battles and training.
Another characteristic is the exploration of his relationships. His friendship with Bakugo is a popular theme. Fanfics might show how they support and challenge each other. Also, his relationships with his other classmates are often explored, like how he can be a source of motivation for them.
You can write about their training together. For example, describe how they push each other to become stronger, and the friendly competition between them. This would show their growth as heroes - in - training.
One popular trope is 'enemies to lovers'. In many fanfics, two characters who initially dislike each other gradually fall in love. Another is 'the chosen one' trope, where a character is singled out for a special mission or power. 'Soulmate' trope is also common, where characters are fated to be together in some way.
One popular theme is their teamwork. Fans love to write about how they work together in battles, like combining Bakugou's powerful explosions with Kirishima's hardening ability to defeat enemies. Another theme is their friendship growth. It shows how they start off with a somewhat rocky relationship and gradually become closer comrades.
One popular trope is the 'alternate universe' where the Avengers' story unfolds in a completely different setting or with different character dynamics. Another is the 'character redemption' arc, like when a villain - like character tries to become good. And of course, there's the 'team - up against an overpowering foe' trope which is classic in Avengers fanfics.
One of the most common tropes is the 'fish - out - of - water' story. For example, when a character from Earth is suddenly thrust into the strange and often dangerous world of the Stargate planets. It creates a lot of opportunity for character growth and discovery.
One popular trope is 'enemies to lovers'. In Sterek fanfic, Derek and Stiles start off not getting along but gradually fall in love. Another is 'soulmates'. Fans like to write about them being fated to be together. 'Hurt/comfort' is also common, where one of them gets hurt and the other takes care of them.