I am the oldest in the Zoldyck family, I am 25. The Zoldycks are a long line of Assasins, the current generation of us has five children, the second oldest is Milluki, hes 17, third is Killua hes 14, fourth is Alluka, he is 12, and fifth is Kalluto he's 10. 

I use Needles to stab my opponents, I put them in the brains of my opponents to control, its my Nen ability called "Needle men" Killua calls them "Needle people", he doesn't understand my ability well though.