Mary "MK" Katherine

Mary Katherine (or MK for short) is to be the protagonist from the movie Epic.

Epic
MK is the 17-year-old daughter of the eccentric scientist Professor Bomba, who is studying a race of little people called the Leaf Men who protect the forest. She discovers one of them and shrinks down to their size. It is up to MK to defend the magical land - and her estranged father - from an army of troll-like, decay-spreading monsters known as the Boggans, and their sinister leader Mandrake. She teams up with Nod, the spirited warrior, Bufo, the gangster-like toad; Mub and Grub, the hilarious slug and snail, the courageous General Ronin, the wise Queen Tara, and the scroll-keeper Nim Galuu.

Trivia

 * Mary Katherine is probably named after William Joyce's late daughter.
 * She is voiced by Amanda Seyfried.