|I have only seen him in Harry Potter and Doctor Who so...not really anything entailing noble bearing.
He was also in Bright Young Things, a Stephen Fry adaptation of Evelyn Waugh's Vile Bodies. (Love the book, quite liked the movie.) He played a rather repellent character, a member of the aristocracy with a nasty little moustache, and a rival love interest to the main character. I love how David Tennant can play people who are SO sleazy and repulsive you just want to wipe them off your shoe... and then turn around and play the most adorable, charismatic, infectious character you would jump into a TARDIS with.
Philip Seymour Hoffman has that talent too - watch him in Capote and then in State and Main, the difference is unbelievable. It's a rare gift. I guess you have to have the right sort of face... Jude Law, for instance, ALWAYS has that cold steely look in his eyes, that I can never get past when he's supposed to be playing a likable character. Anyway. Not relevant.
I heard he did Hamlet on stage. Maybe he had a noble bearing in that?
(Apparently he was brilliant
, I wish I'd seen him! Hmm, wonder if any of it's on YouTube?)
Also.... dance of joy that NZ got to keep the filming!