Tropes/Affably Evil

Niceness of inherently evil character is sincere.

(Laconic description)

Music

 * D'Aristocrats are this. Despite showing cruelty to rival kingdoms and revolutionaries in their mythos, they are actually nice to their fanbase in Real Life.

Western Animation

 * The Good, The Bad and The Kid: The Purple Chameleon is this to François, even letting him play dress-up using his disguises.