Typical characters in a '7 minutes in heaven fanfic' can be high school students. They are in that age where there are a lot of budding romances and hormonal changes. They might be the popular jock and the shy nerd, or two best friends who start to see each other in a different light during those 7 minutes. Another common type could be young adults at a party, like college students. They are more likely to be a bit more adventurous and confident in their interactions during the 7 minutes.
Often, in '7 minutes in heaven fanfic', you'll see the main character and their love interest. This could be a boy-next - door type character and the girl he has had a crush on for ages. Or it could be two rivals who are forced to go into the '7 minutes in heaven' situation and end up realizing they have more in common than they thought. There could also be characters from a particular fandom, for example, characters from a popular TV show or book series, who the fans love to pair up in this kind of scenario.
In '7 minutes in heaven fanfic', the characters can vary widely. It could be two siblings' friends who have known each other for a while but never really interacted much on a personal level until now. They might be from different social groups within a school or community, like the artsy group and the sporty group. Sometimes, there are also characters who are new to a group and this '7 minutes in heaven' becomes a way for them to bond quickly with someone from the group, leading to a potential relationship or a strong friendship.