One idea could be '5 Times Bakugou Saved the Day'. It would show his heroic side as he uses his powerful quirk to rescue people in different dangerous situations. Another idea is '5 Moments Bakugou Realized His Mistakes', which would focus on his character growth.
One idea could be that in the future, Bakugou and Midoriya become partners in a new hero agency. They've grown past their childhood rivalries and now work together to take on new and powerful villains. Their combined skills, Bakugou's explosive power and Midoriya's strategic use of One For All, make them an unbeatable team.
One idea could be that Bakugou wakes up with a strange quirk malfunction that makes him overly nice. He starts complimenting his classmates, which leaves everyone in shock. For example, he tells Deku that his analysis skills are actually really impressive. This throws the whole class dynamic off, but in a really interesting way.
One plot idea could be that Female Bakugou is somehow transported to the Naruto universe. She could initially be frustrated and start causing a ruckus, but then gradually learn to adapt. Maybe she teams up with Naruto to fight against a common enemy, like an Akatsuki member who has some strange new power. Along the way, she might teach Naruto some of her own combat techniques and in return, Naruto teaches her about chakra.
A possible plot is a power struggle between them. Since Deku has turned villain, he might see Bakugou as a threat to his plans. Bakugou, on the other hand, wants to bring Deku back to the light. This creates a constant back - and - forth of battles, both physical and psychological, as they try to outwit each other.
A '5 times bakugou fanfiction' could be really interesting. It might explore five different emotional states of Bakugou. One time could be when he was extremely angry and how that affected his actions. Another time could be when he was vulnerable, perhaps after a difficult battle. Then there could be a time when he was happy and celebrating a victory. And two more times could be related to his growth as a character, like the first time he realized he needed to change his attitude towards his friends, and the second time when he actually made a significant change in his behavior.
One idea could be that the genderbent Bakugou has to deal with different expectations in hero society. Since she's female now, some might underestimate her strength at first. Another plot could involve her having a different dynamic with the other characters, like a more sisterly bond with Midoriya.
One interesting plot could be that they are forced to team up for a really difficult mission. During this mission, they start to understand each other's strengths and weaknesses better. Izuku might learn some new combat techniques from Bakugou, and Bakugou could gain a new respect for Izuku's strategic thinking.
Bakugou might react with his usual anger. He could lash out at the bullies verbally or even physically, which might make the situation worse. For example, if someone makes a snide comment, he could respond with a loud and aggressive retort.
One idea could be that female Izuku, with her determination, constantly challenges Katsuki in hero training. Their rivalry turns into a deeper understanding and they start to support each other more. For example, in a joint mission against a powerful villain, they realize each other's strengths and weaknesses and work together seamlessly, which then leads to a new level of friendship that could potentially turn into something more romantic.
One idea could be that in an alternate universe, Bakugou and Toga are forced to team up during a villain - hero cooperation event. They start off hating each other but gradually come to understand each other's motives. Another could be a situation where Toga takes on Bakugou's appearance to get closer to the other heroes and ends up having some really strange interactions with Bakugou himself. Maybe she tries to use his appearance to cause chaos but then realizes she doesn't really want to hurt him in the process.