Books
Irvin is an avid reader outside of Harry Potter, and when the opportunity presents itself, cosplays characters from his other favorite book series.
Percy Jackson by Rick Riordan - five different characters, as well as cosplays from the musical adaptation by Rob Rokicki & Joe Tracz
The Hunger Games by Suzanne Collins: Finnick Odair, Effie Trinket, Venia
Seven Realms by Cinda Williams Chima: Han Alister, Micah Bayar
Lockwood & Co by Jonathan Stroud: Anthony Lockwood
The Lunar Chronicles by Marissa Meyer: Carswell Thorne
The Geek's Guide to Unrequited Love by Sarvenaz Tash: Graham
And, although Irvin never read Twilight and carries a large amount of disdain for it, he did end up cosplaying Edward Cullen for a play.