Here's a quick list I threw together:
Bring back Bryce Papenbrook and Cherami Leigh. These were amazing guests!
Sarah Anne Williams
Cassandra Lee Morris
Christine Marie Cabanos
Okay, I just listed all the VA from SAO Ordinal Scale and I know many of them have other roles they've played outside of SAO.
Jason David Frank
Austin St. John
I know a handful of the guests have been to Otakon's prior, but still wanted to throw their names out there.