|Relatives||Sawai Yusuke (brother)|
|Anime Debut||Episode 02: Aikatsu☆彡Let's go!!|
Yataro has a nice and brother like personality towards his students. He doesn't want to be considered as a teacher that's why he tells the girls to call him by his first name. When having a good mood, you can even make jokes him with. But Yataro is also a very serious person and can get loud when he's angry. He is continually seen worried about his brother Yusuke and is afraid that he can't help him in bad situations. As Yusuke and Yataro aren't at home with their parents, Yataro says he's alone, the only one here to care for Yusuke.
- Sawai Yusuke: Yataro's younger brother. Yusuke usually calls him Ya-kun or Taro. But mostly Taro. As Yusuke used the be sick when he was a child, Yataro is extremely worried about everything his younger brother does and fears that the sickness might come back. Since Yusuke collapsed during the Fortune Cup, Yataro and Yusuke live together again.
- Sawai Masayuki and Sawai Reika: They are Yataro and Yusuke's parents. They were always glad that Yusuke was able to get along with his older brother Yataro like that.
- Watanabe Itsuki: Yataro is the older brother of Itsuki's best friend. But more about their relationship is unknown.
- Yataro's birthday falls on February 12th, which makes his zodiac sign to be Aquarius (♒).
- Yataro is the youngest teacher at Three Hearts Academy.
- Due to this and due this alternative way of teacher, the other teachers tend to dislike him.
- Yataro's Kirakiratter name is @SawaiYaakun.
- His and Yusuke's Kirakiratter names are based on how they call each other.
- Yataro asks his students to call him Yataro-sensei instead of "Sawai-sensei".
- Yusuke usuualy calls Yataro either "Ya-kun" or "Taro".
- Yataro tends to call himself "Taro", rather than Yataro or anything else.
|Ainochi! Idol Series Characters|
|Main Idols (f)||Taiko Mirai • Igarashi Masae • Hisakawa Hoshi • Ishimura Kibou • Akita Kazue • Imamura Futaba • Hojo Miki • Nishimoto Aya • Wazahara Kiyomi|
|Main Idols (m)||Shiomiya Ryuichi • Sawai Yusuke • Okumura Seiji • Hagiwara Takao|
|Other Idols||Todo Kaguya • Mikami Shizuka • Komiya Aimi • Aoyama Kiki • Himura Aki • Harukaze Maria • Rikawa Kimi • Daichi Manami • Kyuno Hikari • Kumazaki Hiroshi • Kazuki • Junichi|
|School Staff||Fukumi Umiko • Nakazato Isao • Shinko Hitomi • Tsuruga Oharu • Sawai Yataro • Kuroji Konosuke|
|Others||Taiko Haruka • Taiko Setsuna • Igarashi Mayumi • Igarashi Taka • Mishima Tomiko • Hisakawa Sara • Hisakawa Rin • Ishimura Shizue • Shirayuki Hiro • Dr. Brightwood • Sawai Masayuki • Sawai Reika • RUMI • Mascots|