One common theme is friendship development. Since Kirishima and Bakugou start off as classmates with very different personalities, a lot of fanfictions focus on how they grow closer as friends. Another theme is mutual respect. Bakugou is often seen as a brash character, but in Kiribaku fanfictions, Kirishima's ability to see past that and earn Bakugou's respect is a big part.
Growth is a huge theme. Both characters are aiming to be heroes, and fanfictions often explore how they help each other grow in their hero journey. For example, Bakugou might teach Kirishima more about combat tactics, while Kirishima helps Bakugou with his people skills. Also, the theme of loyalty comes up often. They are shown to be loyal to each other in many different situations in these fanfictions.
One common theme is the struggle with identity. Since Kirishima or Bakugo (depending on who is the vampire in the story) has to deal with being a vampire, they often face an internal struggle. For example, if Kirishima is the vampire, he might worry about how Bakugo will see him now that he has this new, darker side.
A common theme is the exploration of their hidden feelings. In many of these fanfictions, Kirishima and Bakugou are often portrayed as having repressed emotions for each other that are finally expressed through the lemon aspects.
Well, there's a fanfiction called 'Kiribaku: Unlikely Bonds'. It begins with Kirishima being assigned to work on a project with Bakugou, who is initially reluctant. But as they spend more time together, they start to understand each other better. Also, 'The Kiribaku Dynamic' is a good one that explores their friendship and how it might be something more in the context of the My Hero Academia world.
Another common theme is the idea of a different perspective. Fanfictions may show events from the Hero Killer's point of view, which is different from the typical hero - centered view in the original series. This can make readers see the world of My Hero Academia in a new light, understanding the frustrations and reasons that led the Hero Killer to do what he did. It can also create more complex relationships between characters as they start to understand each other's motives better.
One common theme is self - discovery. When they travel through time, Bakugo and Kirishima often learn more about themselves, like their true feelings and potential. For example, they might realize how much they've grown or what they still need to work on.
A common theme is the exploration of power. Since both universes have characters with unique abilities, fanfictions often delve into how these powers are used, abused, or developed further.
One common theme is the exploration of Stain's sense of justice. Since he has a very distinct view on what makes a true hero, fanfictions often delve into this concept, comparing it with the more mainstream ideas of heroism in the 'boku no hero academia' universe.
One common theme is friendship. Just like in the original series, the pets and their owners or the pets among themselves form strong bonds of friendship. For example, a dog might be extremely loyal to its hero owner and help them in times of need.
One common theme is redemption. Since Garou is often portrayed as an anti - hero or a villain, many fanfictions explore his path towards redemption. Another theme is power struggle. Given the power - filled world of My Hero Academia, fanfictions often deal with how Garou's power relates to that of the heroes and villains.
The theme of adaptation is also prevalent. Characters from both sides have to adapt to the new and strange world they find themselves in. For instance, the heroes in My Hero Academia might have to adapt to the more gritty and dangerous world of Hellboy, and vice versa. This can lead to character growth and new relationships being formed.