He is the defacto leader of the X-Laws, only overruled by Iron Maiden Jeanne. He originates from Sicily, Italy. Orphaned from an early age, Marco was raised in a Catholic church-orphanage by a priest. Together with Jeanne and Lyserg Diethel he is part of Team "X-I".
His spirit ally is Michael, the archangel and his weapon of choice is an automatic 9 mm handgun. He is strict, and will even punish his own subordinates if they disobey or fail their tasks.
Marco, who is created by Hiroyuki Takei, has no current information on what inspires the author to create him.
Marco's spirit ally is Michael the Arch Angel and his spirit ally is created from a car. Marco's spirit medium is his 9 mm gun.