As a fan of online novels, I can't directly judge whether you have the ability to write a best-selling novel. However, from what you have learned about online literature, if you want to write a best-selling novel, you need to have the following abilities:
1 Storyline: A good story needs to have a fascinating plot, conflict, and climax.
Character Creation: You need to consider your character's personality, background, goals, etc. and give them depth and complexity.
Writing Skills: You need to master writing skills including language, rhythm, etc. to ensure that your novel is easy to read and understand.
4. Originality: A good novel needs some unique creativity to attract the reader's attention.
If you were able to have the abilities in the above aspects and could turn your creativity and storyline into specific novel content, then you might be able to write a best-selling novel. Of course, this also required continuous practice and improvement.
I'm not entirely sure who all the main characters are without reading it more closely, but there's probably a protagonist who drives the story forward.
In 'I am the Villain' novel, the central character is the villain. There could be a mentor - like figure who either guided the villain in the wrong direction or is now trying to correct their ways. There may also be a rival villain who competes with the main villain for power or territory. And don't forget about the ordinary people in the story, whose lives are affected by the actions of the villain and the other main characters.
Since I'm not familiar with the 'I am death novel', I can't say for sure. But it could have a character who represents death as the main character. There might also be characters who interact with this 'death' figure, like a human who is trying to bargain with death for more time.
It's possible that there is a character who is in a state of transition or change. This character might be the central figure in the 'Here I Am Novel'. They could be facing challenges in their life, such as a career change, a move to a new place, or a shift in relationships, and through these experiences, they are evolving and coming into their own, which ties in with the title.
Without having read the 'am i a demon or a god novel', it's hard to say for sure. But it's likely that there is a central character who is on the verge of realizing their true nature. There might also be some antagonists, like other demons or gods who oppose the main character's journey or try to influence their decision - making process regarding their identity.
In the 'I Am Legend Graphic Novel', the central character is Robert Neville. He is a complex figure, alone in a world overrun by strange and often menacing mutants. There may also be other minor characters that play roles in Neville's struggle for survival and his attempts to understand what has happened to the world, but Neville is the main focus around which the story revolves.