James Potter enters Hogwarts, clashing with society's expectations, new friends, slimy Slytherins, and his not-entirely-functional family. Beatrix Perplex, after being bounced around her whole life, is tossed into Slytherin. In a House w/ families of ages past, she struggles to make a name for herself when everyone else already has one. NextGen. Partially OC-centric.
We go through the years at Hogwarts, but Daphne has a twin and Marcus has a younger sister. Hogwarts doesn't take their impact perfectly, but manages. Featuring the life inside the snake pit, as well as the workings of the government. Bad summary, better writing.