2018

Fenrir Greyback Peter Pettigrew Pomona Sprout

2018 is the first year since 2014 that Irvin didn't go to an HP con, so there were fewer new costumes debuted than usual.

In fact, there is a shocking consistency here: the years in which Irvin doesn't attend a convention, exactly three new HP costumes end up debuting. 2018 follows this pattern, established in 2014, 2012, and 2009.