|Also known as||Sudou-senpai, Oni no Sudou|
|Affiliation|| Tonan University|
|Relatives||Yuuko Matsumoto (wife in anime)|
|Drama|| Episode 6 (2005)|
Episode 2 (2007)
Episode 7 (2010)
Episode 6 (2013)
Episode 2 (2014)
Episode 11 (2015)
|2010 K-Drama||Choi Sung Guk|
|2013 J-Drama||Masaki Kaji|
|2014 J-Drama||Masaki Kaji|
|2015 Th-Drama||Techin Chayuti|
|2016 Tw-Drama||Cliff Cho|
Sudou (須藤 Sudou) has liked Yuuko since college, but hasn't been successful in winning her heart.
Kotoko describes him as someone who has a dual personality. He is very kind when he's not holding the tennis racquet, but once he holds it, he becomes vicious and competitive (most especially to Irie, but he always loses to him).