Arashi's little brother.

A Septentrion and a Major General of the OSF and Arashi's younger brother. He possesses the psionic ability of cryokinesis, allowing him to conjure and control ice at will. He was a childhood friend to Karen and Luka and bethroted to Alice, until her tragic transformation into an Other. Unneerved by the lengths Karen was willing to undertake in order to save Alice, Fubuki decided to join Yuito and Kasane's attempts to stop him and convinces him to honor Alice's wish to save the world. The plan to shut down the Kunad Gate is successful, but Karen sacrifices his own life to save Alice, erasing everyone's memories of him, Fubuki included.

(Source: Wikipedia)