[Melakon]

According to Memory Alpha...

Nicole de Boer had an absolute blast making this episode, and afterwards she asked, "Can I play this character all the time?" Louis Race points out, "Nicole's performance gave me a real appreciation of her skill as an actress. She wasn't just playing 'Cute in Leather'. She became a much more sinister and driven, harder-edged character." DeBoer herself says, "After playing sweet Ezri, I thought, 'Yeah! This is gonna be fun!' Not that Ezri was too sweet, but this was just really fun to do." (Star Trek: Deep Space Nine Companion)

And apparently Mirror Ezri wasn't a Dax.