Most famous living character actors

[JoeKryten]

Everyone knows his name but he has very few lead roles, so: Vincent D'Onofrio

Also, despite Monk: Tony Shalhoub

Listing Shalhoub reminds me that in the fall of 2002 we got three different new TV series lead by consummate character actors which seemed like an odd confluence to me at the time.

Monk
Hack
and the short lived Robbery Homicide Division