As of the current manga chapters, Bakugo doesn't come back to life. The plot follows a certain trajectory, and a revival for Bakugo isn't part of it. Maybe there could be unexpected twists in the future, but for now, no revival.
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.
I'm not sure which particular fanfiction you're referring to. Some fanfictions do involve Pit getting kidnapped, but without knowing the specific one, it's hard to say for certain.
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.
Bakugo is known to curse in the manga. This is used to emphasize his strong emotions and aggressive nature. However, the frequency and severity of the cursing might vary depending on the context of the scene.