|Debut (Anime)|| Episode 1 (voice only) |
|Voice Actor (Japanese)||Yuichi Nakamura|
|Work & Relations|
|Family|| Izumi Kyouka (Sister)|
Izumi Masamune (Son)
Izumi Sagiri (Step-daughter)
Izumi Kotetsu was the father of Izumi Masamune and the older brother of Izumi Kyouka. After the death of his first wife, he remarried and became the stepfather of Izumi Sagiri after marrying her mother.
He has dark eyes and messy dark hair, similar to Masamune as well as some facial stubble. He is usually shown wearing a business suit or a less formal brown sports coat, tan t-shirt and blue-grey slacks
He is shown to care for his son and is usually smiling. When he noticed that his son was sad after the death of his mother, he encourages him to smile and enjoy life. After seeing how Masamune felt when he realized that he wanted to be an author, he encourages him by giving him a laptop and later helps him carry his manuscripts, noticing how confident his son was.
- Izumi Kyouka - Sister
- Izumi Masamune - Son
- Izumi Sagiri - Step-Daughter
- Yuichi Nakamura, the Japanese voice actor for Kotetsu Izumi, also voices Kyouske Kousaka from Ore no Imōto ga Konna ni Kawaii Wake ga Nai, who appears at the end of episode 11, as he and his group walk past Masamune.