Looking back at Fanime 2015's guest list, they haven't been the strongest.
Just recently, however, SacAnime 2016 had the strongest guests I've ever seen at a convention- Charles Martinet, Dameon Clarke, Veronic Taylor, Ashly Burch, and Olivia Olson, just to name a few.
Fanime needs to catch up guest wise, and I'd like to make one suggestion: voice actor Erica Mendez. Erica has starred in the roles of Aladdin in the English dub of Magi: The Labyrinth of Magic, and Ryuko Matoi in the English dub of Kill la Kill. She is also currently voicing Sailor Uranus in the newest dub of Sailor Moon. Needless to say, Erica has quite the roles under her belt.
It's still the beginning of January, and I think we still have time to even consider her as a guest.