2. Richard Griffiths
Unfortunately, when this Tony Award winning actor passed away in 2013 (at the age of 65), not that many people looked back at his accomplishments.
This was perhaps due to the fact that Griffiths almost always played the roles that were meant to be hated by the audience, which only means he was doing a great job.
Richard had a big career and a big heart, and that is exactly how he will be remembered.