There will always be seven Knight’s at one time, one for each year group in Hogwarts. Each Knight is chosen in their first year, (although they can be challenged at any point to a duel, the winner will take the Knight title) The Knights have their own system inside themselves. The seventh year Knight has the most power out of the Knights and the first year has the least. Each Knight has leadership and power of their year group, the year groups below them and the Knights below them. But all Knights are treated with the same respect by ALL Soldiers, despite differences in ages. (so a sixth year would have to show a third year Knight the same respect as the sixth year Knight. But a third year Knight couldn’t boss them around or give them punishments) They don’t have named advisers like their Acting Prince/Princess, but it is common for their best friend to talk to them and offer advice should they need it. Each Knight is responsible for their year group, if someone is behaving in a way that insults Slytherin and/or the Acting Prince/Princesses rules and the Knight of their year doesn’t do anything then they will be stripped of their title and be punished with the offender by the Acting Prince/Princess. Their main job is to help their year group appear united at all times outside of the common room. But they are also expected to keep an eye out for bullying or struggling with school work within their year and below.