In Exalted, Malfeas, the DemonCity, has particular talents in ostentatiousness, force, and rulership. A common fan depiction has him spending his entire time with his volume turned up to about nineteen.
Werewolf: The Apocalypse had Zhyzhak, the signature Black Spiral Dancer. Her little form of Wyrm-touched madness was an inability to control the volume of her voice, making the MOST MUNDANE ANNOUNCEMENTS sound like fevered ranting.
a passing mention in Magic: The Gathering, on one of the flavor texts for Chandra's Outrage, "Chandra never believed in using her 'inside voice'.".