Hope you do not mistake him for a girl. He will get upset. Ne?
A cold winter days eve... Mountains of isle of Nishishima... a castle of Yashima is embraced in fire. Enemy army marches in and pillages every corner of the fortress. They do not take captives. Castle's garrison perished or commited suicide. Finally a regiment of invaders reaches the upper floor of the main keep, they slam the last door out... there they find a seven years old boy, the last child of clan Shirayuki. The howling of the wind gains power and a suddnly silence falls upon it.
A boy looks over the room. Walls are frozen, corpses of frozen invaders lie still. He looks on the floor, a large snowdrift is there with some blood on it. Child closes his eyes for a second. He does not seem to express any emotions. No fear no pain, no hatred...
That day Shirayuki no Kyogetsu left his home, Yashima. He wandered off to mountains and has become known as the Ice fiend.
PS: Want to apologise for some inconvenience Kyo may have caused in past. He is biologically nothing to do with "fiends". Ice Fiend is rather a nicname, but by no means a race.