Marcel is the control officer of the Vanadis, an armored control vehicle serving as the 1st Armored Group's mobile headquarters. He studied together with Shin and Eugene during their time at the special officer academy. He was formerly a Vánagandr pilot before suffering a debilitating injury.
Marcel was an immature and spiteful cadet during his time at the special officer academy. He harbored a mistrust of the battle-hungry Eighty-Six, preferring to avoid them. His preconceptions were, in his eyes, confirmed when Eugene was euthanized by Shin. With the grief of Eugene's death and his own injury, he ended up pinning the blame on Shin and manipulated Nina into sending him malicious letters. He later realized his errors and apologized to Shin.