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.
Definitely not. Genya remains outside the ranks of Hashira throughout the manga. This is because of a combination of factors such as his skills, experiences, and the overall direction of the story.
The '2 moons novel' could potentially be a science - fiction or fantasy novel. If it's science - fiction, perhaps it's set on a planet with two moons and the story revolves around how this unique astronomical feature affects the planet's ecology, civilization, or the characters' lives. In a fantasy context, the two moons might have magical properties that the characters interact with or are influenced by.
The '2moons2 fanfic' is probably centered around the '2moons2' universe. Fanfics often take the existing elements such as the setting, characters, and basic concepts of the original work. In the case of '2moons2', it could be about the different races in the game. Maybe a fanfic would explore a love story between characters of two different races that are normally in conflict in the game. Or it could be an action - packed adventure where a group of characters from '2moons2' embark on a quest that was only hinted at in the original game.