Chew Show Mao is Luke Skywalker (a New Hope)
Nicole Seah is Princess Leia (pretty and intelligent)
Chiam See Tong is Obi-Wan Kenobi (wise but can't stop the Dark Lord from rising)
Chan Chun Sing is Kendal Ozzel, military man who is arrogant and will meet a force stroke from Vader.
Tin Pei Ling is Jar Jar Blinks--can't talk properly and easily swayed by the dark side of the foce
Slyvia Lim is Mon Mothma, "academic" but will fall (see Expanded Universe books)
Tan Jee Say is Crix Madine was from the Empire but now is part of the Rebellion
Tan Chuan-Jin is Firmus Piett, loyal military man (to Vader)
Low Thia Kiang is Lando Clarissian, gambling his way by moving to a GRC
Ang Yong Guan is urm Han Solo, knows how to fight (was a Colonel)
Feel free to change around or add. Especially Han Solo--can't think of who resembles him best.
As for Darth Vader and the Emperor, you know who best resembles them.
Haha--may the force be with the Rebels!
Funny you should you be using the Star Wars character...I had been using the STAR WARS movies to explain to my son about the GE and how Luke Skywalker represents the younger opposition members based on the title "A NEW HOPE"...and we don't need to explain who is playing the character of "DARTH VADER"..