is the Major of the NOL, being one of its elite commanding officers. He is
always cool and calm, but is also easily jealous, ambitious, and possessive,
with little care for others, treating them like they're just obstacles. He
displayed formidable actions to gain his rank during the Ikaruga Civil
When he heard that his older brother, Ragna, had arrived on the scene, he
quickly abandoned his post to hunt him down by himself. The truth however is
that Ragna is Jin's biological brother, and Jin's early feelings of rivalry were
furthered by his visions of the future and his Nox Nyctores' amplification of
his emotions. Terumi caused Jin to kill Saya and hack off Ragna's arm (later
nearly dying without the intervention of Rachel), and Jin often says that he's
looking forward to killing Ragna again.
After the incident, he was adopted into the Kisaragi house, a highly powerful
and respected family within the NOL. He possesses a notable psychosis, said to
be caused by his sword, the Nox Nyctores "Yukianesa". While the sword
grants him manipulation over ice, it also enhances primal feelings and is often
blamed for "insanity".