If you are looking for a less mainstream Harry Potter costume, this one is an easy last minute look to throw together (it's Halloween today in case you forgot). From Instagram user _gilligan_ (also known as Gillian Ramos), this Professor Quirrell costume makes magical use of an infinity scarf as a turban. The only other thing you need is a suit.
For her Harry Potter costume, muggle Gillian was unable to transfigure her appearance so she turned to the transformative powers of makeup to make her look more like the Sorcerer's Stone villain.
If you need a last minute Halloween costume, this is an enchanting pick people will think you put a lot more effort into.