Obi Wan

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A jedi master, general in the clone army and the one who defeated Darth Vader on Mustafar. He weilds a blue light saber that has been used to fell countless droids and separatists alike.

Anakin Skywalker

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Another of the great generals of the clone wars and a skilled swordsman despite his recklessness. During the events that followed during the third film, Anakin became Darth Vader, lead the assault on the Jedi temple during the order 66 and even attempted to kill his own master: Obi wan who managed to defeat who was once his padawan.

Clone Trooper

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The main infantry during the long wars between the Republic and the Separatists. They were all clones of one of the most feared bounty hunters: Jango Fett. They are typically armed with Blaster rifles for gunning down Battle Droids

Droideka

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The Droideka, what should have been called the 'anti-everything' is a walking turret that can roll into a ball for quick movement and can raise a shield around itself once deployed. They are weak but their nigh invincible shielding and twin blasters make up for their lack of armour.

Ralph's edit: I've still never watched any Star Wars.