Zebro is one of two groundskeepers at the Zoldyck family's estate on Kukuroo Mountain. He acts as a gatekeeper in front of the Testing Gate at first glance, but is actually just a janitor that cleans up after Mike (the largest Zoldyck guard dog) after it disposes off intruders. Even though he doesn't look like a man of muscle, he actually is muscled and astoundingly strong.