They are two 14-year-old best friends who met at the hunter exam. They are both wonderful nen users and very strong. Gon has slightly tanned skin and greenish-black hair, on the other hand, Killua has pale skin, white hair and blue eyes. They are also friends with Kurapika and Leorio although they do not always accompany them. Killua belongs to a family of assassins although he prefers not to talk about it. And Gon's father is a very important hunter named Ging, although he does not love Gon.