Kiriko

Kiriko (キリコ, Kiriko) are Magical Beasts that can change their own physical appearance.

Hunter Exam arc
A family of Kiriko outside of Dolle Harbor serve as navigators to the examination hall for the Hunter Exam. They used their shapeshifting abilities in order to pretend to be a human family under attack by Kiriko in their natural form to test Gon, Kurapika, and Leorio. They are impressed with Gon's superhuman senses, Kurapika's knowledge of ancient symbols, and Leorio's kindness in treating the supposedly injured man.

Greed Island arc
They later guide Killua to the examination hall during the 288th Hunter Exam upon learning of his friendship with Gon. They are very eager, at that time, to hear of Gon's adventures, sighting the fact that they "miss the lad."

13th Hunter Chairman Election arc
A Kiriko is seen (the son), posing as Gotoh after his death so that Killua won't know that he was killed.