The Angel's Keyblade~ Trivia Question 3

Well, two down and two to go. These first questions will be about the Kurai Family's traits and characters, but afterwards they'll be on how much you're paying attention to the story^^

This question is for Arashi, Hikari's youngest brother and based off my youngest brother, for who's name in Japanese is "Arashi" The answer is also my brother's real favorite fairy-tale creature. Do you think you know the answer?