The characters below form the movie's "power trio" (like Luke, Leia, and Han in ANH):
Nellith Lars: the pre-eminent member of the Jedi Sentinels, a Jedi order charged with the compilation and guarding of Holocrons. She guards a powerful secret that she will defend to the death against the wrath of the Clones.
Ben Cortel: an aged navigator on a spice freighter. Ben holds a skeptical, sardonic attitude, no doubt because of multiple run-ins with the law. Due to his experiences in the seedier parts of the galaxy, he holds no special stake in the conflict wracking the Republic...but fate will intertwine his destiny with that of the galaxy's.
Anakin Skywalker: a teenage runaway from the urban planet Taris. Anakin grew up under an abusive father named Logan Skywalker. Young Anakin ran away from home at the age of 15 when his father took Mother Skywalker's life. Anakin has spent the last four years in Taris' underground swoop racer scene, quickly rising to become a capable pilot (racing under the stage name of "Anakin Redblade") and a sly fighter. Anakin's fate, however, will not keep him on Taris forever...