Jared played the main character of Supernatural, Sam Winchester .. He also played Lucifer, the archangel
(while possessing Sam's body) ..
There is no doubt that Sam and Lucifer are opposites of each other, Sam is a really innocent and kind man who dedicated his life for hunting the supernatural evil! and Lucifer is Lucifer ! He's Satan!
Sarah played the twin sisters from Ringer, Bridget Kelly and Siobhan Martin .. Bridget and Siobhan are extremely different too, Bridget is a drug addict or was in the beginning .. Siobhan in the other hand, a rich new yorker ..
Famke played Jean Grey and Phoenix in X-Men: The Last Stand .. Jean is sweet woman who cares a lot for her friends which made her sacrifice herself for them in the second movie!, yet Phoenix reflexes all the evilness in Jeans mind and all of her "uncontrolled" powers!
The twin brothers in The Spiderwick Chronicles, Jared and Simon Grace, were played by Freddie .. Jared and Simon have opposite personalities. While Jared is the brave one, Simon is the more clever and rational.