Based on number of film appearances in 2016. Who else can it be? Suda Masaki with 9 films (2 lead roles). Surprisingly, he shares the title with Ikematsu Sousuke, whom he co-starred with in 『Setoutsumi』 and 『Death Note』 this year. Suda also did 2 dramas, 1 drama special, 1 online drama, and several guest appearances and endorsements. You workaholics.