I first saw Tanaka Koki of KAT-TUN in My Boss My Hero (2006) where he plays Manabe Kazuya, a Yakuza henchman loyal to Sakaki Makio (Nagase Tomoya), the drama's hero.
He was fun to watch although he has limited screen time. His character Kazuya is weird because he is Yakuza with a tough exterior who loves both Makio and knitting. Oddly enough, I loved watching him and I waited for his appearance in every episode, which is rare of course. He is one of the best comic relief of the show.
He won the Best Supporting Actor Award for his role in My Boss My Hero in the 50th Television Drama Academy Awards (2006).
Together with Kuriyama Chiaki, finally he stars in his own drama: Tokkyu Tanaka San Go (2007).
Synopsis:
Tanaka Koki plays his first lead role in a drama series in this romantic comedy. He stars as Tanaka Ichiro, a newly matriculated student at Sangyo Ryutsu Daigaku, abbreviated as "Sanryudai" (third-rate university). His dream is to meet his own "personal heroine," and he thinks that Meguro Terumi (Kuriyama Chiaki) may be the one. But in his pursuit of love, a series of events leads him into the world of "tetsu," otherwise known as railroads. With no knowledge of the subject, he ends up involved in a railroad club with data maniac Hanagata Kei (Tsukamoto Takashi) and the eighth-year student Momoyama Seiji (Akiyama Ryuji).
Source:
Dramawiki