Quote:
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At his feet upon the steps sat a wizened figure of a man, with a pale wise face and heavy-lidded eyes.
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This all I can find initially about his appearance. It doesn't say anything about him being dark haired so I think they were able to use their imagination a little when casting/dressing Grima. That they chose to have him as a dark haired but pale skinned man plays on established figures of fear in films - the established idea of a hero in a film does not look like Grima (let me pause here and say Hurrah for Tim Burton and Edward Scissorhands...
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But it is possible that 'book' Grima may have looked like that anyway; perhaps if he was slightly 'different' to the other men in Rohan it might explain why he sought to be a counsellor rather than a horseman. He may not have had the stereotypical appearance or build of a rider. But then I'm not sure the makers of the film would have picked up on that kind of idea.