Shinichi Tsutsumi (a versatile genius, go and watch his movies and you'll realize how underrated this guy in international fandom)
Takayuki "Yuusha" Yamada (can play crazy diverse roles)
Fumiyo Kohinata (the best utility actor EVER in Japan)
Kento Nagayama (very underrated and underused young lad, he is competent but yet to get his big break he deserves)
Keisuke Koide (though somewhat he is on decline, his past works are joyful to watch. Awesome and selfless supporting actor that is a rarity in J-Drama and Movie scene)