Kalluto Zoldyck

Kalluto Zoldyck is the youngest sibling of Killua. He first appeared with his mother during Gon's mission to rescue Killua from Kukuroo Mountain. After working with Illumi to eliminate mafia leaders in Yorknew City, he joined the Phantom Troupe as Hisoka’s substitute during the Greed Island arc. Although he serves the Spiders, his objective during the assault on Zazan’s palace was to force Killua back to the Zoldyck estate.