Honestly I'm not sure this should really be in the subreddit as I'm more aware of him through his TV appearances than movies but Ron Funches.
All his lines are the delivered in the same "I'm confused, what's going on?" type of expression. In Harley Quinn he at least gets to sound worried or angry sometimes but there's still not a whole lot of emotional variation he gets to express.
But I just love the dude's voice; it's just so...funny and goofy. Anytime he pops up in something or I hear his voice in something it's just so comforting even if his actual acting is one note.