Emma Watson as Renesmee Swan/Cullen
Vampire Gift: Showing other people her memories and thoughts by one touch.
Cameron Dallas as Edward-Jacob (EJ) Swan/Cullen
Vampire Gift: Communicating and mind control through mind.
Megan DeAngelis as Guinevere (Gwen) Swan/Cullen
Vampire Gift: Invisibility
Katherine McNamara as Jennifer Cullen
No Vampire Gift
Alex Aiono as Noah Rinaldi
Non vampire
And the rest of the Twilight Characters are played by the same person :)