One of the reasons I like Elvira is because (and this is definitely not an unproblematic portrayal) she does have much more complex feelings towards Giovanni

And she has glorious music (but that is true of all the characters in this show)! I like her a lot, too, because her story (manipulation but no physical force involved in her encounter with Giovanni) and her love for Giovanni shows that he can be genuinely charming and seductive. He's more interesting as a charming yet sinister person, one whom you can't help but be attracted to even though you know you should know better, someone who can use force or manipulative charm, than as a plain old lecher or a cardboard villain who never appeals to anyone.