Current role: Tom Chadwick, Family Tree (HBO)

Family Tree is one of the best sitcoms that you’re not watching, and O’Dowds’s charm is a big part of the show’s allure. You probably know him best as Jenna’s doomed husband from Girls, but Tom Chadwick is more in the vein of O’Dowd’s nice guy, sincere act that he displayed in Bridesmaids. He's usually the straight man to whatever quirky family member he's encountering for the week, but he's never outshined.