Evil Is Sexy/Image Links

Anime:
 * from Pokémon.
 * Scanty and Kneesocks want you to make believe it's the first time.

Live Action TV:
 * Scorpina from Mighty Morphin Power Rangers.

Video Games:
 * from Darkstalkers.
 * from System Shock 2.

Webcomics:
 * It's a frequent theme in Sinfest, and here's one example.

Western Animation:
 * The Trix from Winx Club
 * from Adventures of Sonic the Hedgehog