Emperor Palpatine (main villain of the OT)
Darth Sidious (the real villain of the PT)
Jedi Knight Anakin Skywalker (the Main character of the PT)
Jedi Knight Luke Skywalker (the Main character of the OT)
Jedi Knight Revan (the Main character of KOTOR)
Darth Revan (the Main character of KOTOR)