Adam was an angel with a human appearance. Most of the time, he wore a mask that appeared similar to other Exorcists, though with normal-looking eyes and golden facial expressions. The mask also held a pair of horns similar to an Exorcist, albeit longer, smoother, and with a golden ornamental attachment on the tips. Under his mask, he is revealed to be a fair-skinned angel with golden-yellow eyes that have dark bags underneath, a stubble-beard on his chin, and slightly messy, short cedar-brown colored hair. He also had a pair of large and golden wings on his back. In contrast to other angels that have appeared thus far, Adam's halo was bright gold in appearance, and similar to the Exorcists, has two spikes pointing up and down from each other, though these spikes are located at the front of his halo as opposed to the likes of Lute's halo, which has its spikes in the middle, joined by a small dot. He wore a smooth white and golden cloak that appears to have a large 'A' symbol emblazoned on the front. His visible hands were black in appearance, and had gold-tipped spikes on the back of his collar. Adam appeared very egotistical and unsympathetic. As the leader of his Exorcist army, he took his stance as the Exorcists' head figure very seriously, sending antagonistic threats towards demons and anyone for standing in their way or whoever disobeyed his command, as he did so with Vaggie for refusing to kill a Sinner, cutting her wings, and leaving her in Hell. He also displayed traits of extreme narcissism and chauvinism, believing himself the perfect man due to being the first and claiming he had never made a mistake in his life, since he was the first man to be born on Earth. Adam was also quite cruel and sadistic, openly admitting in front of Charlie that he enjoyed killing demons, calling it entertainment, and tended to announce how many killed in the Extermination. He also dismissed Charlie's project of redemption not because he didn't believe in sinners being redeemed.