Hogwarts: Voldemort, Your Ancestor Is Back

I, the great Salazar Slytherin, the founder of Hogwarts, the founder of Slytherin, the protector of magical apprentices, return today to my loyal Hogwarts. I was very happy at first, until I got bored and put on Godric's old hat. "... I'm sorry, Lord Salazar. If measured according to the current evaluation standards... You actually do not meet the current Slytherin screening standards." "Or rather, you're a good Gryffindor." Now I'm not happy. Speaking of which, you may not believe it, but I, the dignified Slytherin, was actually rejected by the Slytherin House that I founded? —————— Several years later, when the Big Four reunited, Gryffindor held up a painting. It was the common room of Slytherin House. There were magical photos of all the deans of Slytherin, but there was no Slytherin. "This is my latest work," Looking at Slytherin whose eyes were about to burst into flames, Gryffindor proudly puffed up his chest. "I named this painting, 'Slytherin in Gryffindor'!" —————— Professorial text