Unknown Gladiator

The Au Ra adventurer who fathered Mikhail Yamada sometime after the Fifth Umbral Calamity. He was known to be somewhat stoic but a protective person at heart, and he died during an expedition as is tragically common among unprepared adventuring parties. Usubeni Yamada is cagey about the details of their relationship, but it's heavily suspected she named Mikhail after him and at least liked him enough to mourn his loss.