My picks:
Michelle Ruff (Rukia in Bleach, Sinon in Sword Art Online, Rita in Tales of Vesperia, Etna in Disgaea)
Ronald Banks (Quan Chi in Mortal Kombat X) (he'd make a kickass Singed)
Clancy Brown (Lex Luthor in various Superman cartoons)
Who are your picks?
I keep writing letters to Nicolas Cage asking him to voice Singed but he must not-a got 'em there probably was a problem at the post office or something sometimes I scribble addresses too sloppy when I jot 'em.
We have to have someone voiced by the famous Tara Strong, who's basically voiced all of Cartoon Network at some point.
Tim Curry ( Nigel Thornberry)
for 
rework "Smashing" Everytime Malphite Ults
Jennifer Hale
Dante Basco.
Jake Long from American Dragon
Zuko from Avatar Last Air Bender
His voice acting is great.
Morgan Freeman.
Anyone who says someone else is wrong.
I still cant beat ToV damned final boss is bs*[slayer-jinx-unamused]*
my picks
Steve Blum (Wolverine in pretty much any X-Men cartoon) - he'd make a great voice for Darius if we ever get an anime
Peter Cullen (Optimus Prime)
Dan Green (Entei, Atem from Yu-Gi-Oh!) - Garen could work
Eric Stuart (Brock from Pokémon and Seto Kaiba from Yu-Gi-Oh!)
Mark Hamill, for a new skin in the Chosen line.
Roger L. Jackson (Ghostface voice from Scream movies, Mojo Jojo from PPG, Cheshire Rabbit, Dormouse, and Jabberwocky from the Alice games)
I personally think his Ghostface voice would work well for Fiddlesticks.
: "What's your favorite scary movie?"
I am going to go ahead and state the obvious Keith David needing to voice Galio.
Steve Blum for 
Darin Du Paul.
Troy Baker, who voiced Joel from The Last of Us and Erron Black in Mortal Kombat X, among a lot of other stuff
