Gon is a young boy with long spiky black green tipped hair and large, hazel brown eyes. Gon Freecss (ゴン゠フリークス, Gon Furīkusu) is a Rookie Hunter and the son of Ging Freecss. Illumi currently seems to be the only person that Hisoka Morow claims as a friend, although their relationship is unconventional. Illumi is a Zoldyck, so it's likely that he has a high tolerance for pain and didn't consider the possibility of Gon having the capabilities to do any notable damage, so he probably didn't even notice that Gon was gripping hard enough to break it until after it broke. During the 287th Hunter Examination, he appeared under the guise of Gittarackur (ギタラクル). This can be seen when Gon breaks his arm, he doesn’t react with pain and takes it casually. Illumi being a Zoldyck has enormous physical strength, good speed, resistance to poison and huge pain bearing capacity. While one may think of him as weak for letting Gon break his arm, Gon is pretty strong as a kid and Illumi sort of let him break it.
Finding his father is Gon's motivation in becoming a Hunter. Illumi Zoldyck (イルミ＝ゾルディック) is the first eldest child of Silva, and Kikyo Zoldyck.