|Debut|| Chapter 203 (Manga)|
Episode 8 (Live-action)
|Voice Actor||Hikaru Midorikawa|
- Bakki - Zekki's older brother.
- Minki - Zekki's younger sister.
Jigoku Sensei NubeEdit
Jigoku Sensei Nube NeoEdit
It's revealed that Zekki is still alive even after his body was destroyed by Nube (Thought Zekki can't move or even talk), Bakki sents his body back to the hell after the fight. After the Onis back to the hell, along with Minki was trying to recovers Zekki's body.
A few years later, the Onis was fight against Daira Setsuki Tentei, who wants to destroys the human realms. After Zekki was injured by Tentei from protect Minki, Bakki requested Zekki goes to the human realms to tells the current situation to Nūbē and his friends, that they have to prepares to fight against Tentei later in human realms if Bakki and Minki was failed to stop him.
- Out all of three Onis, Zekki's appearance look totally same as a normal humans without his transformation.