Kirishima is from a manga/anime. His back story involves him having a sense of self - doubt initially. He admired those with strong and manly qualities. He worked hard to overcome his insecurities and develop his own strength and courage, eventually becoming a reliable hero - in - training.
One key element is his inspiration. He was inspired by heroes, which motivated him to pursue the hero path. Another is his self - doubt. He had to overcome it to move forward. And his quirk development. Learning to control his 'Hardening' quirk was important in his origin as a hero - in - training.
Kirishima's origin story is quite interesting. He is a character who has a strong sense of determination. He grew up idolizing heroes who were brave and selfless. This admiration led him to enroll in a hero academy where he could train to become a hero himself. He has always been driven by the desire to prove his worth and protect others, which is a big part of his origin as a hero - in - training.
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.
Kirishima is still alive in the manga. The story doesn't have that plot point. Usually, character deaths are significant events and are clearly shown if they occur.
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.