I don't know if it's popular. It depends on how widely it has been shared and the communities that have picked it up. If it has been spread across multiple social media platforms or has a dedicated following in certain online subcultures, then it could be considered popular. But without proper research, it's hard to say for sure.
Well, Naruto himself would be the most prominent character in Naruto helicopter fanfiction. Since it's about Naruto and his 'helicopter' aspect, he would be the center of the story most of the time.
One horror story is when a helicopter parent followed their college - aged child to campus and tried to attend classes with them, thinking they could help with note - taking. Another is a parent who constantly called their child's boss at their part - time job to complain about the work hours, which embarrassed the child and almost got them fired. And there was a case where a helicopter parent barged into their teen's school dance to make sure they were dancing 'appropriately' which was extremely mortifying for the teen.
A theme could be power and control. The helicopter man has the power to fly and often control the situation in the air. Also, a sense of exploration is common. He can explore uncharted territories from the air. There might also be a theme of responsibility, like if he is a rescue or military helicopter man, he has a great responsibility.
You can buy a helicopter in GTA 5 story mode by reaching a certain level and having enough in-game money. Then, look for the relevant dealership or website within the game.