|Relations||Nana Ebina (sister)|
|Anime||Big Brother Departs|
|Japanese voice||Nobuhiko Okamoto|
Koichiro has short dark brown hair, typically tied up in a red-and-white hair tie on the top of his head.
He is usually seen with a chef's outfit on with a red scarf, his chef's hat shadowing his face to the point where it's impossible to see any facial features except his eyes.
Being a Master Chef, he's always serious whenever he's working. He has a strict and serious personality, despite that he's easy to embarrass shown when Taihei complimented him as his face immediately turned red and steam started pouring out of his head with a workmate of him claiming him to be a Tsundere embarrassing him even more, much like his younger sister Ebina.
He's a passionate about his occupation as a cook and even asked Taihei if he wanted to work in their restaurant, showing that he had respect towards those who knew how to cook and is good at it.
- Taihei and Koichiro met during Taihei's business trip.
- He immediately deduced that Taihei works not for himself but for someone else the first time he saw him cooking.
- Ebina mentioned that Koichiro left their home when she was only seven and had not seen him or spoke to him since then.
- Ebina's hairbands for her twin-tails are the exact same pattern and color as Koichiro.