I was with the belief that we're having a seven deadly representative (Headmaster Pride, Cody Lust, Therium Envy). And thought that Alvy was Greed, still believe it was Greed. But his backstory, the wall paper have goat head which often associated with Lust, what does that mean Minoffur ;-;.
Anyway, SCRIPPLE IS NOT DEMON OF LUST!! HE'S PRIDE!!! He's the Demon sin of Pride in the world of Lust (the energy of the world revolves around Lust).