There can be only one. One actor I like, one role that represents them. One film, one actor. Alphabetical by actor. 

Moisés Arias | Jonathan Bailey | Christian Bale |Jamie Bell | Gunnar Björnstrand | Brian Blessed | Matt Bomer | Adrien Brody | Daniel Brühl | Montgomery Clift | Joel Edgerton | Mark Feuerstein | Glenn Ford | Ben Foster | John Garfield | Tom Hardy | Tom Holland | Rock Hudson | Ewan McGregor | Paul Mescal | Toshirō Mifune | Viggo Mortensen | Jack O’Connell | Dev Patel | Théodore Pellerin | Tyrone Power | Max Riemelt | Franz Rogowski | Andrew Scott | Randolph Scott | Max von Sydow | Ben Whishaw