The main character is probably the so - called 'black heir'. However, depending on the plot, other important characters could be members of the Black family. They might be there to guide or oppose the heir. And, of course, it's possible that some of the Hogwarts professors could be significant characters too. They could play a role in the heir's education or in dealing with the secrets and challenges that come with their heritage.
I'm sorry, without actually reading it, it's hard to say for sure. But it might include characters related to the Black family like Sirius Black or Narcissa Malfoy, and of course, the new 'black heir' character who would be central to the story.
Since I haven't read this specific fanfic, it's hard to say for sure. But likely, Harry Potter would be one of the main characters as it's in the title. There might also be his friends like Hermione and Ron, as they are often part of Harry - centric fanfictions. And there could be new characters introduced that are related to the idea of him being the heir of many things, such as those who guard or know about the inheritances.
It's possible that the main characters are not just from the Harry Potter side. There could be some characters from the lore of Mordor that are brought into the story. However, I'm sure Harry, Hermione, and Ron would still play important roles. Maybe the heir of Mordor is a half - blood or has some connection to the wizarding world that makes their interaction with Harry and his friends inevitable. They could be either an antagonist trying to bring Mordor - like chaos to the wizarding world or a more complex character who is struggling with their dark heritage.
Obviously, Harry Potter is likely to be one of the main characters since it's related to him. He could be the one who discovers he is the Heir of Peverell.
In many fanfics like 'Harry Potter Heir of Fortunes', the main characters usually start with the well - known trio from the original series: Harry, Hermione, and Ron. However, if it's a more creative take, the main character could be a previously unmentioned character who is the heir. There might also be antagonists, perhaps some pure - blood supremacists who don't want the heir to claim their fortune because it could disrupt their status quo in the wizarding world. Or it could be a dark wizard who wants the power associated with the fortune for his own evil purposes.
Well, Harry Potter is bound to be a main character. The heir of Durendal is another main character as the whole fanfic is centered around this concept. In addition, Dumbledore might also be an important character. His wisdom and guidance could be crucial in dealing with the situation regarding the heir. And there might be some new characters introduced specifically for this fanfic, who are related to the Durendal heir's backstory or powers.
Then there are the other members of the Black family, either alive or in portraits. They could be sources of information, guidance, or obstacles for the heir. For example, Walburga Black's portrait might be constantly berating the heir or trying to steer them in a more traditional, dark - leaning direction of the family's history.
The heir of the Black family is the key character, of course. But other characters like Hermione Granger could also be involved. She could help the heir with her vast knowledge of magic. And Dumbledore might also show up, as he has a deep understanding of the wizarding world and could offer advice or warnings to the heir.
Obviously, Harry Potter is one of the main characters since the story is centered around him being the heir of Black. Sirius Black might also be an important character, as he was a Black himself and could play a role in Harry's discovery or training. And of course, Harry's friends like Hermione and Ron would likely be involved too.
In the 'harry potter vault of the warrior heir fanfic', the main characters could be quite diverse. There might be a character who is a direct descendant of the Warrior Heir, who is driven by a sense of duty to discover the vault. This character could be joined by a group of friends with different skills and personalities. For example, one might be really good at magic theory and helps to decipher any clues related to the vault. Another could be brave and physically strong, providing protection during their adventures. There could also be a mysterious character who seems to know more about the vault than they let on, and they either help or hinder the group depending on their own motives.