To be honest, I'm not sure I agree with any of the suggestions above... Somehow Patrick Stewart seems too stern to be Mhoram, and perhaps a little old. I always pictued the Bloodguard as quite short, and well-muscled, but not
too well-muscled

Bruce Lee would have been good...
I can't bring Guy Pearce to mind, so I can't comment on him as TC. Where might I have seen him?

I do, however, agree that Robbie Coltrane would be quite a good Foamfollower.
I'm intrigued by this idea of casting LF. Since his appearance tends to be a bit fuzzy and indistinct (kind of out of focus was how I pictured it), you couldn't cast an ego-maniac A-lister

How about the bloke who plays Emperor Palpatine? Or, in a break from typcasting, he could perhaps be the elderly Mhoram - he has the prominent nose, and the bearing of one who knows too much...