Movies where the character changes

Great acting all around, esp. Mortensen.

It depends on the change I guess...

There's this change:

Then there's this change:

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Oxfords not brogues.

How about Sarah Connor's change between T1 and T2.

Natalie Portman in Goya's Ghost
James Franco in 127 hours
Bradley Cooper in Limitless

Might get killed for saying it, but think about Luke Skywalker from the first film until the last.

Michael Douglas in Falling Down

George Clooney in From Dusk Till Dawn.

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Here, if you have a milkshake, and I have a milkshake, and I have a straw. There it is, that's a straw, you see? You watching?. And my straw reaches acroooooooss the room, and starts to drink your milkshake... I... drink... your... milkshake!
-Daniel, There Will Be Blood

Change in the most literal sense.

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Fear and Loathing in MoFo... The Gunslinger 45's Top 50 Favorite Films

In the 10 Ring: Gunslinger45's reviews

Easy. The Fly.

Michael Corleone-The Godfather
Harvey Dent-The Dark Knight
Anakin Skywalker-Star Wars Saga

Those are the 3 Main,Main ones imo