I always like to pick voice actors for my characters, so I have an idea of how they sound just by comparing them to the way those VAs are known for speaking - or a role I like them speaking in. Unfortunately, the ones I have solid choices on haven't debuted in my comic yet. Ian Sinclair is a definite choice for one of them, though, because he always does a great scoundrel.
Mostly I have "that one guy" assigned to them, because heck if I can remember the names of the voices I associate with various archetypes.