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kalluto is killuas younger brother and the youngest out of all of them if killua did not leave the family business he would have became the head of the house like they were setting him up to do. They said that if he kept up with his training (their kind) he could be the strongest zoldyck of all and Kalluto was shown to be strong but still had a lot of work to do. killua would win defiantly

my opinion of the strongest to weakest zoldyck siblings in battle/fight

Illumi,killua, Kalluto, Milluki and Alluka (Alluka is only last because yes her powers are strong but in an all out fight it would be hard to with with her power ya know)

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