Several of the new characters are played by Me and My Dick alums. Flopsy is Lupin, The Old Snatch is Sirius, Big T is Yaxley, Weenie is Lily, Hedwig, and Luna.
Tyler Brunsman (Cedric Diggory) is Lucius Malfoy.
Brian Rosenthal, who played Quirrell, now plays Seamus Finnigan. And James Potter in a flashback.
Jim Povolo now doubles as both Goyle and Firenze.
In A Very Potter Senior Year we see many actors who haven't been in a Starkid production for a while.
When the kids go back in time and they see themselves in the past, they're all played by people in the play who look nothing like them. Draco is played by the tallest guy in the show (Jim Povolo a.k.a Goyle) Hermione is played by a husky man (Richard Campbell a.k.a Neville), Ron is played by a much skinnier guy (Brian Rosenthal a.k.a. Seamus), and Harry is a petite Asian girl (Sango Tajima a.k.a. Lavender Brown) in an afro wig.