"Please, sit down before you fall down. We can at least behave like civilized people"
-Rene Belloq to Indiana Jones
"Affably Evil" pertains to villains or antagonists who, in spite of their villainous/antagonistic nature are legitimately nice, friendly, and polite when interacting with most other people, even the heroes oftentimes. Now, to be Affably Evil, the following must be considered:
- Affably Evil villains are NOT just villains who pretend to be nice and it's all just an act. Affably Evil villains really are that nice.
- There is a difference between Affably Evil and what is called Faux-Affably Evil. The latter pertains to characters who for all their sounding polite would clearly throw you in front of a bus without a second thought and don't actually value life or people's well-being anymore than any other villain does. Thus, their sounding polite but not acting it just makes their villainy stand out more rather than less. Conversely, Affably Evil characters are perfectly nice, amiable people to most everyone else, except for people who actively get in the way of their malevolent goals and try to oppose them, and even there they may retain a civil nature. So for characters to be genuine Affably Evil they must actually care about other's well-being to some extent and only be willing to hurt/kill those who are directly in their way and opposing them.