Zenko/Relationships

Bad
As her big brother, Bad greatly dotes on Zenko and cherishes her. He values promises between them to the point of risking injury. This is seen when he stopped attacking Garou when Zenko was present as Bad promised to never show her violence.

He also seem to spoilt her and putting her as his main priority as he agree to take her to the theme park even though he dislike crowed area

Garou
Zenko interferes between Metal Bat and Garou's fight. Zenko demands Garou and Bat to not fight in front of her because Bat promised her not to show her violence. Garou is initially against her outburst but finally decides to accept her proclamation. Similar to Tareo, Garou seems to have a level of care for Zenko because she's a child.

He stops Sludge Jellyfish from attempting to kidnap Zenko. While his motivations in engaging the monster was because he was being observed and wanted to confront his observers, he only engages Sludge Jellyfish after he was about to kidnap Zenko. Further, despite how he was in a rush to find Watchdog Man, he stays behind to watch the monsters leave the area and away from the unconscious Metal Bat and Zenko.