|Japanese Voice||Kazuyuki Okitsu|
|English Voice||Robbie Daymond|
|Manga Debut||Chapter 07: Cloudy Skies|
|Anime Debut||Episode 05: Gray Skies|
Saitou is an attractive teenage boy with neatly trimmed dark brown hair and dark brown eyes. He can be seen wearing his school uniform throughout the series.
According to Tsubaki Sawabe, Saitou is hot, dependable and admired by many girls. Throughout the anime, he maintains a friendly and outgoing personality. He is understanding and did not get jealous even though Tsubaki constantly rant and talk about Kousei Arima. Later on in the anime, he broke up with Tsubaki, stating he likes the manager of his baseball club and that both of them are too alike to be in a relationship. Though, it is likely that he broke up with Tsubaki because he didn't want to see her suffer.
Tsubaki also states that she has a crush on him. Apparently, he also had a crush on Tsubaki, though it is not known when he started having a crush on her.
Saitou has a passion for baseball and was the captain of Tatsusumi Middle School's baseball team. After graduating, he joined his high school's baseball club.
Saitou was the former captain of Tatsusumi Middle School's baseball team before he graduated. It is likely that his crush on Tsubaki was developed in middle school.
- (To Tsubaki Sawabe) "You and I... We should be with the people who are the total opposite, probably."