Kōichi Sakuranomiya is the older brother of Maika Sakuranomiya.
He has black hair that is a bit below his ears and has his bangs parted back. He has the same eye color like his sisters Maika and Aika, but his eyes are more slanted than Maika’s. He wears blue traditonal japanese clothes.
Like his sisters Aika and Maika, he is a naturally sadistic character.
He cares for his family as he tends to worry over his sister Maika's social life. This was seen when he met her friends and coworkers who came to visit her after she was sick and he took pictures of them to celebrate her growing social circle.