Kiriko

A beast that can change its physical appearance. A family of kirokos uses their shapeshifting abilities to pretend to be a human family under attack by kirikos in their natural form, in order to test Gon, Kurapica, and Leorio. The pass, and the kirokos reveal their true purpose - navigators who guide worthy Hunter Exam registrants to the exam site. In the following year, they also guide Killua to the exam site upon learning of his friendship with Gon.