Seto Koji

• Name (romaji): Seto Koji
• Nickname: Setomaru
• Profession: Actor and Singer
• Birthdate: May 18, 1988
• Birthplace: Fukuoka, Japan
• Height: 175cm
• Weight: 52 kg
• Star sign: Taurus
• Blood type: A

Mengawali debut dengan bergabung menjadi D Boys dan grub band TETRA FANG sebagai vocalist. Kemudian mengawali akting menjadi pemain Kamen Rider Kiva (2008) dan terpilih menjadi pemain pendatang terbaik. ^_*

• Sadako 3D (2012) as Ando Takanori
• Moshidora (2011) as Asano Keiichiro
• Runway☆Beat (2011) as Mizorogi "Beat" Biito
• Kamen Rider × Kamen Rider Double & Decade: Movie War 2010 as Kurenai Wataru
• Ju-On - Black Girl (2009) as Tetsuya
• Kamen Rider Kiva: King of the Castle in the Demon World (2008) as Kurenai Wataru
• Shakariki (2008) with cameo appearance
• Kamen Rider Den-O & Kiva: Climax Deka (2008) as Kurenai Wataru
• Tenshi ga Kureta Mono(2007) as Hayama Izamu
• Tonari no Yaoi-chan as Tibe-kun (2007)
• Hit Parade as Tiger's member (2006)
• Teen Court as Saburo Takada (NTV, 2012)
• Kurumi no Heya as Mitamura Kentaro (NHK, 2011)
• Yotsuba Jinja Ura Kagyo Shitsuren Hoken~Kokuraseya as Kinoshita Sho (YTV, 2011, ep 10)
• Gou as Mori Ranmaru (NHK, 2011)
• Nasake no Onna as Akagawa Tomoya (TV Asahi, 2010)
• Tumbling as Takenaka Yuta (TBS, 2010)
• Rinne no Ame as Mikami Shuhei (Fuji TV, 2010)
• Otomen as Yamato Ariake (Fuji TV, 2009)
• Atashinchi no Danshi as Okura Satoru (Fuji TV, 2009)
• Kamen Rider Decade guest starring as Kurenai Wataru (TV Asahi, 2009, ep1,31)
• Koizora as Sakurai "Hiro" Hiroki (TBS, 2008)
• Kamen Rider Kiva as Kurenai Wataru / Kamen Rider Kiva (TV Asahi, 2008)
• Abarenbo Mama as Abe Naoya (Fuji TV, 2007)
• Happy Boys as Segawa Kyoichi (TV Tokyo, 2007)
• Rocket Boys as Kanno Makoto (TV Tokyo, 2006)