Affably Evil

These are villains who are genuinely friendly and kind, despite being villains. This is often a redeeming quality, and many Fallen Heroes also maintain their "affable" and noble traits. On the other hand, there are villains who pretend to be nice, but aren't doing it genuinely (Faux Affably Evil). Technically, though, it's still "nice", if it positively effects the person that's receiving this type of treatment.