The 'obey me novel' often involves a story where the protagonist is immersed in a world full of demons. There are various characters with unique personalities and powers. The plot usually includes elements of the protagonist's interactions with these demons, building relationships, and dealing with different challenges and mysteries in this otherworldly setting.
In 'obey me novel', the main characters are the human protagonist and the group of demons. Among the demons, Mammon is known for his greed and his rather comical antics. Leviathan is the otaku - like demon who is into anime and games. There are also other brothers like Satan, Asmodeus, Beelzebub, and Belphegor, all with their own quirks and characteristics that play important roles in the story.
The 'obey me full story' is about a human who gets thrust into the world of demons. You have to navigate through the Devildom, which has its own hierarchy and power dynamics. The demon brothers play significant roles. For example, Lucifer is the strict and powerful eldest brother. As the story progresses, you learn more about their pasts, their relationships with each other, and how the human fits into this complex world of magic, mystery, and demonology.
A 'brainwash obey me and only me' fanfic could be a very interesting and perhaps a bit dark concept. It might involve a character using some sort of magic or psychological manipulation to make another character obey them solely. For example, in a fantasy setting, a powerful sorcerer could cast a spell on a hero, making the hero forget their previous loyalties and only follow the sorcerer's commands.
Inosuke doesn't become a Hashira in the manga. The story progresses with him having other significant experiences and achievements instead of achieving that specific position.
It's hard to give an exact number. Different story arcs and battles led to the deaths of multiple hashira. Some died heroically, while others met their fate in unexpected ways. The count changes as the manga progresses.