Ooh, I like the idea of Mark Rylance! He's excellent in
Bridge of Spies (which I recommend) and plays a wonderfully serious character who hides a spark of humour.
I thought Joe's idea of John Cleese was interesting, but personally I don't really see it. I mainly know Cleese from
Fawlty Towers, where he plays a frenetic, angry character. Hilarious, but the very opposite of Puddleglum! Of course, actors can play very different roles from what they're known for. Robin Williams in
One Hour Photo, for example.
Burn Gorman I have seen in several small roles, and also in
Pacific Rim and
The Man in the High Castle. I find him a little creepy (!) which again isn't my idea of the character. I liked him a lot in
Pacific Rim, where he was brilliantly awkward.
I kind of have someone like
William Fichtner in my head when I imagine Puddleglum. I haven't seen him in very much, but I imagine a kind of quietness. I suppose because he plays a very gentle character in
Contact.
My idea of Puddleglum is of someone who doesn't know that he's a bit ridiculous and humorous. I don't want the character to be aware that he's funny, or for him to be cracking jokes all the time. I believe he says everything with complete seriousness.
I can see Hugh Laurie pulling off that dry, serious kind of humour.