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.
Well, it depends. Just because the story is based on a real story doesn't necessarily mean the serpent is a literal, physical snake. It could be a symbolic serpent representing something in the real - life events, like a person or an organization that acts in a sneaky or dangerous way, much like how a snake is often seen in literature. But if it is a more straightforward account, then it could be a real snake.
Naboo was a terrifying giant snake from legends. It was said to be at least 30 meters long, with a dragon-like head and seven nostrils. Nabu's existence was mentioned in ancient legends in Malaysia, but no one had ever seen this animal in real life. In ancient Chinese legends, the oral records of the Amazon tribes, and historical materials from other places, there were also giant snakes. The known giant land snake was a boa, which lived in tropical rainforests. The largest boa was about 26 meters long and 1.2 meters wide after its bones were restored. There was not much evidence of giant snakes in the sea, but there were reports that in 1937, fishermen in Iceland saw a giant snake that swam quickly under the sea surface. It was estimated to be about 30 meters long. At present, the information about the Naboo giant snake mainly came from legends and ancient records. There was no conclusive scientific evidence to prove its existence.
The Giant Serpent was a character from Norse mythology, known as Jormungand. It was the son of Loki and the female giant Angelborda, and the brother of the Death Goddess Hale and the giant wolf Fendril. Jermungander was thrown into the ocean of the human world by Odin, but it grew there and became so large that it could circle the earth and bite its own tail. Therefore, it was called the " World Serpent." Thor became the archenemy of Jemengard. I don't know much about the Giant Serpent.