This is the doppleganger, an imposter demon who shape-shifts into a corrupt version of Devilman, destroying the people whom Devilman swore to protect. It terrorizes cities and puts it all on Devilman's tab.
Re-sculpted the ears to look more like wings, re-sculpted the wings to add more definition and used auto-body paint (cerulean blue)on the inner wings and body. The wings can be easily removed in order to turn the head.
This demon was later killed by Zann, mistaking him for the real Devilman. Accepting no imitation, Zann was thrown into deeper fury by this subterfuge.