4. Taron Egerton - Tim Drake
Egerton has the thankless job in 2014's Kingsman: The Secret Service of playing an aimless chav shepherded by several grand characters played by Colin Firth and Michael Caine, and he had to do it while also portraying his character "Eggy" with enough common sense and determination so as to not be left behind. He nailed it. He's great in the movie, and he's believable and likeable. He has the physicality and the savvy to pull off the hardest Robin to crack: Tim "Red Robin" Drake.
Tim, much like his mentor, is a wealthy Gothamite whose parents were killed senselessly. Only instead of the other Robins before him, Tim uses his penchant for technology and his budding detective skills to identify Batman as Bruce Wayne. Over the course of his career, Tim lived in the shadow of Dick Grayson's legacy and the painful memories of Jason Todd, always endeavoring to be better than them both. He is the Robin who is closest to Bruce Wayne in that he sees crime fighting as a job that is never finished, rather than a thrill or an outlet for his psyche. He is the smartest Robin, and Egerton's energetic yet measured performance speaks to his capability.