All Might would probably be one of the first to try to stop Bakugou. As Izuku's mentor and a symbol of justice in the story, he wouldn't tolerate such violence. Another could be their teacher, Aizawa. He's strict and protective of his students, so he'd surely step in.
Iida might try to stop Bakugou. He's very much about following the rules and doing what's right. Seeing Bakugou about to kill Izuku would go against everything he stands for. Also, Ochaco. She's Izuku's friend and has a kind heart. She'd do whatever she could to protect Izuku from harm.
Bakugou might be initially shocked. He's used to Izuku calling him 'kacchan' for so long that it's become a normal part of their relationship. So, when Izuku stops, it could throw him off balance.
One possible motive could be a long - held grudge that has festered over time. Maybe Bakugou's constant bullying in their past finally pushed Deku over the edge. Another could be some sort of mind - control or dark influence that made Deku act out of character.
The main characters are clearly Bakugou and Izuku. Bakugou is often portrayed as the instigator, with his brash and sometimes cruel behavior. Izuku is the one who endures Bakugou's actions until he finally snaps.
Some characters might try to understand Deku's motives. Kirishima, who was close to Bakugou, would be angry at first but might also try to find out if there were any extenuating circumstances. However, many would be afraid of Deku, seeing him as a threat now that he has killed one of their own.
In this kind of fanfiction, it usually shows a build - up of tension between Bakugou and Izuku. Bakugou might have been constantly pushing Izuku's buttons with his aggressive behavior and taunting. This could lead to Izuku finally reaching his breaking point. For example, Bakugou's over - the - top insults about Izuku's abilities or his dreams might be too much for Izuku to bear. And when Izuku snaps, it could lead to a big confrontation between them, which can be a very dramatic and interesting plot point in the fanfiction.
I'm not sure if there is such a specific fanfic available. Fanfic topics can be quite diverse, but this one seems rather unethical in the context of the characters' relationships. You could try searching on major fanfic platforms like Archive of Our Own or FanFiction.net to see if it exists.
One possible plot could be that Bakugou constantly bullies Izuku, pushing him to his limits in the fanfiction. Maybe Bakugou publicly humiliates Izuku over and over again about his lack of a Quirk at the beginning. This could lead to Izuku finally snapping and standing up to Bakugou in a very unexpected and powerful way, perhaps even revealing a hidden strength or power that no one knew he had.
Growth is also a major theme. Izuku's act of standing up is usually a sign of his growth, both as a person and as a hero - in - training. It shows that he's not going to be pushed around anymore and is ready to face challenges head - on, which is a big part of his journey in these fanfictions.
You can start by looking on Archive of Our Own (AO3). It has a vast collection of fanfiction, and you can easily search for 'izuku and fem bakugou' fanfiction there. The site also has tags and filters to help you narrow down your search based on what you're interested in, like specific genres or ratings.
One great 'izuku and fem bakugou fanfiction' is 'A New Bond'. In this story, they are forced to work together on a project at school. Fem Bakugou slowly starts to see Izuku in a new light as they overcome challenges together. It's a really sweet story that shows character growth for both of them.