"Tricky customer, eh?" Gabriel grinned at him, a slow, wicked grin. "So you're going to be a challenge. Excellent! I like challenges." He tipped his glass slightly in Aziraphale's direction. "Just means I need to find a suitable subject. So, what's your knucklehead look like, eh? May as well start there."

Maybe he could find an appropriate analogue among the Sleepers. Sure, he'd need to get them piss drunk first, but hey, he could work with that. Or something else, once he had something to start with.