You said that it was the "Most famous characters", this can be misleading, I was putting characters like Godric Gryffindor etc. Instead you should put the "Most well known characters" or something like that. Also you could of had Ernie Macmillan for E, Umbridge for U, and Zacharias Smith for Z.
You don't have to do this, because no one would guess it, but I was going to suggest Urquhart, the Slytherin Quidditch captain the year Harry arrived at school. It wouldn't be good to keep that dash as a "U" but no one would guess this and I guess I'm just repeated myself but for the last time, no one would guess it but I'd just put it there anyway. Or you could just add "U" as a last name and put Umbridge there.
Could you make it so that you only have to put the first name in. It says first name or only name given and so I spent at least ten seconds trying out a bunch of names before realising I needed the surname as well. Other than that, pretty good.
Professor Quirrell's first name is spelled wrong. I was sitting here for 10 minutes straight just trying to find a different character with a Q name (which there arent and i knew that but it was spelled wrong and i tried to spell it out)
However Umbridge isn't a correct answer for U as it is not her first name - I should have made it clear in the Heading.
If anyone has any suggestions for U, it would be much appreciated