Xi-Yu Family

The Xi-Yu Family (シュウ=ウ一家, Shū u Ikka) is one of the three largest Mafia families in the Kakin Empire, and the most powerful by finances and numbers. Third Prince Zhang Lei Hui Guo Rou is one of their benefactors.

Succession Contest arc
Members of the Xi-Yu Family boarded the Black Whale in order to secure territory on the New Continent. The boss is a VIP on Tier 1 of the ship. The underlings are scheming to whittle down the numbers of the two rival families, Heil-Ly and Cha-R, until landfall.

Trivia

 * Taken together, the katakana of the three Mafia families form "Shūeisha", the company responsible for the publication of Weekly Shōnen Jump and of Hunter × Hunter.