Many of his roles don't have character shots (yet!), but here's the stuff we do have. Mr. Williams, you will be missed by many. Goodbye.
To all: If you have one of his performances on DVD, and it's missing in this overview: just post the character shot and send me a shout, so I can add it here.
Good Morning, Vietnam (1987) - Adrian Cronauer
The Adventures of Baron Munchausen (1988) - King of the Moon
Dead Poets Society (1989) - John Keating
Awakenings (1990) - Dr. Malcolm Sayer
The Fisher King (1991) - Parry
Hook (1991) - Peter Banning
Aladdin (1992) (voice) - Genie / Merchant
Mrs. Doubtfire (1993) - Daniel Hillard / Mrs. Doubtfire
Jumanji (1995) - Alan Parrish
Jack (1996) - Jack Charles Powell - Thanks to Oldboy1990!
Hamlet (1996) - Osric
Good Will Hunting (1997) - Sean Maguire
What Dreams May Come (1998) - Chris Nielsen
Patch Adams (1998) - Patch Adams
Artificial Intelligence: AI (2001) (voice) - Dr. Know
One Hour Photo (2002) - Seymour Parrish
Insomnia (2002) - Walter Finch
The Final Cut (2004) - Alan Hakman - Thanks to Zo0!
Robots (2005) (voice) - Fender
The Big White (2005) - Paul Barnell
Man of the Year (2006) - Tom Dobbs
The Night Listener (2006) - Gabriel Noone (thanks to Zo0!)
Night at the Museum (2006) -Teddy Roosevelt
Happy Feet Two (2011) (voice) - Ramon / Lovelace
The Big Wedding (2013) - Father Moinighan
The Face of Love (2013) - Roger (Thanks to Macmono)