5(Harry Potter)

An Au where a few students from Hogwarts from the year Harry started Hogwarts and the same age as her(because Harry will be a girl too) are all girls because we need more badass girls and if there was one thing that unify woman in when man think they actually can control them and have them be their lapdogs(basically that many wizards still thought that woman deserved to stay at home, give birth, take care of children, pleasure their husbands and be good hosts when they husbands need them to organize a party).

All girls in Hogwarts were given two more courses than the man which were one where they were taught everything needed to be a good 'wife' but actually they were taught what they needed to live alone and then they were taught about many ways they could defend themselves from man and unwanted attentions(including marriage contracts).

With them having those courses together, the girls grew united and while in front of others acted as everyone expected(like slythering and gryffindors hating each other, ravenclaws thinking themselves the smartest, hufflepuffs being too soft, etc), behind everyone's back they were friends and always helping each other.

An example, if you go for bad/misguided Dumbledore, could be: He created a contract of marriage for each child of his 'closest' light families and few muggleborns but he wasn't expecting that the pureblood girls would take the others to Gringotts and find out he has been stealing their money and has arranged a marriage for them so together with the goblins(who are always up to messing a wizards' life) read the contracts front and back until they find a way to destroy it or change who the girls will have to marry.

Anyways, I want to watch Voldemort and all the bad guys being destroyed by this big group of badass and powerful woman who will take the wizard world by storm while destroying many men's pride and ego.