6 suggestions
Sam Elliott
as Easy Pete in Fallout: New Vegas
Barry Corbin
as Victor in Fallout: New Vegas

William Hurt
as Doc Mitchell in Fallout: New Vegas

Michael Keaton
as Caesar in Fallout: New Vegas

Danny DeVito
as No-Bark Noonan in Fallout: New Vegas
Judah Friedlander
as Fantastic in Fallout: New Vegas