Seaquant

Seaquant is a Blacklist Hunter and a servant of the Zoldyck Family.

Background
Three years before the beginning of the series, he and 100 henchmen came to attack Kukuroo Mountain, but they were annihilated by Canary, a 10 year-old trainee intendant of the Zoldyck Family. Greatly shocked, he begged to become a servant of the Zoldycks. He is now good friends with Zebro, the old gatekeeper of the Zoldyck Family.

Zoldyck Family Arc
Seaquant first appears when Gon, Leorio and Kurapika try to find a way to meet Killua in the Zoldyck estate. Recognizing in them some talent he alongside Zebro helped them to train in order to open the first level of the great door of the Zoldyck estate.

New Hunter Chairman Election Arc
After the death of Chairman Netero, he appears at the Hunters Association's HQ to participate in the New Hunter Chairman Election.