Imdb's cast list for GoF

[Pernille]

I am really sorry if this has been posted before, but I just checked 
out the page imdb have for GoF and came over the cast listing that 
they have. Although I haven't been reading here for a long time, I 
haven't read any post discussing these actors.

Imdb are not always right about these things, but I'll link it anyway;
http://uk.imdb.com/title/tt0330373/

Could someone refresh my memory, who is Igor Karkaroff?
(Irritates me that imdb have no photos of most of these actors.)
 I found one of Robert Pattinson who has been cast as Cedric Diggory 
on the Internet though. Would the group be interested in having it in 
the photos section?

Take Care
Pernille