Agent Smith

He was the main bad guy in the Matrix movies.

And that elf-dude in Lord of the Rings.

And V from V for Vendetta.

Either way, his most notable line is "Mr. Anderson." This line is usually repeated by moviegoers after any of this lines during whatever movie he appears in next, regardless of his role or the person he is addressing.

I think he had a real name at one time, Hugo Weaving, but that's not important.