高知県生まれ
ニューヨーク・School of Visual Arts, Cartoon学科卒業 (Class of 1998)
帰国後、ゲーム会社(株)WARPを経て、現在に至る。

Ko Takeuchi (born 1970) is a Japanese character designer, illustrator. Takeuchi graduated
from the Cartooning Faculty of the School of Visual Arts in New York. 
After working for a short time at a Japanese game company Warp, Takeuchi joined Nintendo in 2000. Takeuchi is also known by the name of KOKOSAC and works on personal projects.
【ILLUSTRATION WORK】
・Hold My Hand at Twilight (2023, TBS Drama)
・Miki Fujimoto 20th anniversary live (2022)
・Murders at the House of Death (2019, Film)
・SICK’S (2018, TBS Drama)
・Dai Renai: Boku Wo Wasureru Kimi To (2018, TBS Drama)
・Hiyokko (2017, NHK Drama)
・Kono Sa Tte Nan Desuka? (2015 - 2021,TBS Variety)
・SPEC: Close (2013, Film)
・ATARU THE FIRST LOVE & THE LAST KILL (2013, Film)
・ATARU (2012, TBS Drama)
・SPEC: Ten (2012, Film)
・SPEC: Shou (2012, TBS Drama)
・ABEDON (Yoshiharu Abe Official Designs) 
【Books】
・絵本「シャボンだまのきせき」絵(STORY:中居正広 READ:堀北真希)
・Bee and PuppyCat (原作:Natasha Allegri) Eyecatcher, ComicCoverArt, Backup story : "Fairy PuppyCat"
・“Shabondama No Kiseki” Illustration (2013, Picture Book, Story: Masahiro Nakai, Read: Maki
Horikita)
・Natasha Allegri’s “Bee and PuppyCat” Cover Art and Story "Fairy PuppyCat” (Comic, 2016)
【Event】
・ちびまる子ちゃん誕生25周年記念 さくらももこ ちびまる子ちゃん展(香港)
・326プロデュース「12+1」展 キチジョウジギャラリー(東京)
・並木のり子アニメデビュー30周年記念~感謝祭~(東京・赤坂)
・Momoko Sakura’s “Chibi Maruko-Chan” 25th Anniversary Exhibition (2011, Hong Kong)
・326 Produce “12+1 Exhibit” at Kichijoji Gallery (2014,Tokyo)
・Norioko Namiki 30th Anniversary Live (2023,Tokyo)
【OTHERS】
・Wavedash  mascot character/ Wavedash&Madeon feat.ToroyMoi Artwork(2024)
・Eye-catcher for Natasha Allegri’s “Bee and PuppyCat” Animation Series (2017)
・CrunchyRoll Collaboration AnimeExpo Exclusive T-shirt (2015)

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