Marc is a long living demon with his own traumas and problems. He has little to no patience for BS and is always blunt when speaking. He carries confidence in his voice but keeps a level head so he doesn’t come off as cocky or arrogant. He knows what he’s doing and sounds like he does as well when he talks. He takes his position seriously and keeps a serious tone almost all the time unless caught offguard by something he may not foresee happening. 

He tends to have a mid-to low range pitch and a matured voice so his voice doesn't crack. He's got a bit of a London British accent, not too terribly thick.