Seiryu

Seiryu, the God of Frost. That was just a title. Over the millennia since creation, he has taken on many different forms and names, such that his true name is unknown. But that was in the past. Once a great and powerful God of Frost and Winter, after a confrontation with the Goddess of Eternity, he now lives as a mortal amongst what he despised the most- humans. Although he still ages much more slowly than any given human, this aging is rapidly increased from how he once lived. His days numbered, and unable to regenerate a new body and restore his ever-depleting powers, he sought out knowledge from an infamous organization known for dabbling in immoral bioscience. His goal- to restore his godlike power.
Though his plans got derailed as once he joined The Order, he made an unlikely acquaintance and rival in one particular assassin called Ordair. They weren't like the other humans he'd encountered- and that piqued his interest. Soon he found he had become emotionally invested in this individual, and felt his icy heart begin to melt in their grasp. He was afraid of love, and perhaps so too was his partner.