Manhwa (Korean manga). This is here as a warning, the art is cute and welcoming but there's a couple crotch/snatch shot that though, its just of underwear, some parents might freak at even though nothing is shown.
Dorothy isn't Dorothy, she's Mara, but because she can see the yellow brick road and she's in Oz and she's got an annoying terrier named Toto the natives just assume she Must be Dorothy. Along the way back home to Korea she meets the (don't call her Witch) of the East and kills her, a part lion/part girl mutant chimera, a cyborg (codename Tin Woodsman), a clone (codenamed Scarecrow). And when Dorthy gets angry she strips, off screen, and morphs from an average seventh grader in a really hot babe w/powers and and witch hat. The villians get beat up after being stunned by what they saw that we only imagined.
i gave up on this last year, but finished it for this class. Not as bad as it sounds or could have been. Probably shouldn't been in a less than high school library, but don't know why anyone in h.s. or older would want to read it.