No. Fanfic with sexual content is not appropriate as it goes against the general ethical and moral standards, especially when it involves a popular series like 'legacies' which has a wide range of audiences including younger viewers.
Most likely not. Many works named 'Hunter' are imaginative creations, not based on real events. They might draw inspiration from various sources but aren't true accounts.
Most likely not. Usually, works titled Hunter are fictional tales crafted by the imagination of the author. They might draw inspiration from various sources but are not direct retellings of true happenings.
There could be a character who is the keeper of the legacies, perhaps an old family member or a guardian. This character might hold the key to understanding the true nature of the legacies, and the other main characters have to interact with them to uncover the secrets. Without reading the 'legacies novel' specifically, it's hard to be certain about the exact main characters.