The Padawan 'Mara' is Possible named so as a nod to the character Mara Jade from the books in which she was an agent know as the Emperors Hand. She eventually married Luke Skywalker and they had a son called Ben Skywalker.
Darth Vader and Anakin Skywalker appear as separate characters. (Usually, Darth Vader is Anakin Skywalker's alias, when Anakin turned to the dark side and became a Lord of the Sith.) Anakin Skywalker is briefly seen fighting General Grevious, and Vader appears in a few scenes before being turned away a Lego version of George Lucas.