Character profile
Kalluto Zoldyck
カルト＝ゾルディックBiography
Kalluto Zoldyck is Killua's younger brother and is first seen accompanying their mother when Gon comes to Kukuroo Mountain to retrieve Killua.
Story spoilers
Kalluto later helps his older brother Illumi assassinate the ten mafia dons who place bounties on the Phantom Troupe. After the troupe enters Greed Island, Kalluto joins as Hisoka's replacement and eventually reveals that his purpose in becoming a Spider is to bring Killua home.
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