Inosuke survives throughout the manga. The story doesn't have his death as part of the plot. His character remains active and plays a significant role until the end.
There are also fans who might be a bit nervous. They worry that the fanfiction they wrote might not be up to the standards that Dan and Phil expect. But overall, most fans are positive about it. They see it as a unique interaction between their idols and the fan - created content world. And this can lead to more fans being motivated to write better and more creative fanfiction in the hope that it might also be read by Dan and Phil.
The reactions would be complex. Kim's best friends would be in disbelief at first. They might question how this could happen so suddenly. Kim's parents would likely have a serious talk with her about the consequences and the future. Ron's friends might tease him a bit but also realize the seriousness of the situation. Ron's family, especially his mother, would probably start making plans to help them out. As time goes by, all of them would gradually accept the situation and offer their love and support to the young couple.
First, you need to understand Inosuke's character really well. Know his strengths like his amazing physical abilities and his weaknesses like his lack of social graces. Then, choose the world you want to cross him over with. For example, if it's a fantasy world, figure out how his abilities would work there.
Well, Inosuke's origin story is quite interesting. He was found in the mountains as a baby and was raised by a family of boars. This led to his rather unorthodox and savage behavior. He didn't have any proper human upbringing which is why he often acts on his instincts. For example, he is very aggressive in battles and doesn't really follow the normal social norms that other characters do. His origin also influenced his unique fighting style which is very much based on brute force and his animal - like agility.
Inosuke doesn't become a Hashira in the manga. The story progresses with him having other significant experiences and achievements instead of achieving that specific position.