She-Ra - who first appeared in 1985 in the Filmation movie The Secret of the Sword and the Filmation cartoon series She-Ra: Princess of Power - is, of course, the sister of He-Man. Wielding the Sword of Protection, she is granted similar powers to her brother - superhuman strength and durability, for example - as well a few more esoteric abilities, like healing and the ability to speak to animals.
Mike Zeck came up with the actual look and it is a stunning piece of design. All black except for the prominent white spider. Rick Leonardi also did some tweaks to the costume and it soon became the most controversial, yet surprisingly popular costume change in comic book history. Fans were aghast at first but then really started to enjoy the new look. Eventually, the design was adapted for the villain Venom, with Spider-Man returning to his classic look. It is popular enough, though, that it still makes occasional comebacks.