Zapo/Relationships

Marulk
As the youngest member of the Bandits, Zapo cares deeply for Marulk, as seen when he and the other Bandits comfort him for being sad that Reg and Riko left to continue their journey. Marulk also has a lot of trust in the other Bandits, seeing how his first instinct was to get them to help stop the fight between Ozen and Reg.

Ozen
He respects Ozen and follows her instructions. Despite her calling them "good for nothings" it's seen that she cares for them too.

Simred and Yelme
As fellow Subterranean Bandits they share a very deep bond and interact with each other like good friends.