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.
Some adults may feel extremely humiliated. They are no longer children and being spanked makes them feel as if their parents don't respect their adulthood. For example, they might become withdrawn and avoid family interactions for a while.
First of all, communication is key. If a parent catches something like a gay nanny teaching their child about acceptance of all sexual orientations, they should sit down and have a conversation with the nanny. They need to set boundaries if necessary, but also appreciate the positive aspects such as promoting inclusivity. For example, if the nanny is just showing the child that there are different kinds of families in the world through stories, it can be a good thing as long as it is age - appropriate.
If parents come across disturbing content in Descendants fanfiction, they should immediately stop watching it. They can also report the content to the platform where they found it if possible.