Konstantinos Karamitroudis (Greek: Κωνσταντίνος Καραμητρούδης) also known as Gus G, born September 12, 1980 in Thessaloniki, Greece is a heavy metal guitarist. He currently plays with his band Firewind and Ozzy Osbourne. He has also played in Mystic Prophecy, Nightrage, Arch Enemy and Dream Evil.