Pure Evil Villains who were zombified, before or after.

In contrast to most Zombies being mindless, these zombies have a clear moral agency and often enjoy the chaos they cause. If they happen to be the type of zombies that the virus or pathogen they're infected by is contagious, most of them here would be more than happy to spread it, make the spread more efficient, or attempt destroy the cure to the pandemic. Such zombies would also be Misanthropic towards their original species prior to zombification.