Here are a list of foes you will fight against in the game.
The Droid Army
These standard droids of the CIS are easy foes but in number they are quite deadly.
The Super Battle Droid is a super version of the regular Battle Droid.
The MagnaGuard are elite robots that carry things that cant be cut by lightsabers.
The droids will stop appearing as foes after Grievous's death.
Clone Troopers
Basically Clones of Boba Fett these clone troopers look all the same and dress the same and formed the Grand Army of the Republic. The 501st legion is the feared part of the Republic and Vaders personal team. The troopers were cloned from Kaminonians by Sifo-dyas order to counter the Separatist overwhelming Droid army which threatens the Jedi. They battled first at Geonosis to save the Jedi from the Droids but After the death of Grievous Order 66 turned the Clones into Stormtroopers and obey sith lords.
Clnoe Troopers start being foes after Order 66 but the 501st Legion will help out killing Jedi.
The Jedi Order
The Jedi were guardians of Peace for a long time until to many wars made them almost extinct except for Obi-Wan and Yoda who survived Order 66. The Jedi Master Sifo-Dyas requested a clone army to help protect the Republic and help the Jedi but several Jedi left the Jedi Order and that includes Dooku.
The Jedi will appear as foes during Order 66 but watch out for elite Jedi.
The Dark Side
The enemies of the Jedi, They went into hiding until Sidious made a plot to take over the universe. The Sith are all once Jedis until only Jedi Knights can be Seduced to the Dark Side. The Jedi get corrupted due forbidden love and that includes Anakins Mom death(Anakin started going to the dark side after his mom died) and fear of Padmes death(He tried to get Mace to not kill Sidious but ended up in he accidentally slice off Maces hand instead of stopping his purple blade).
Dooku and Anakin will appear as foes in the game but mostly you will control Anakin during a few Jedi killing missions.