Doctor Ossip Halkin is a rigasian military scientist working in the Nuskom Zone. Mostly a minor character that gets reused sometimes

In Session 2 he complained to an army officer about the pesticides.

In Session 3 he was the science guy in charge at the door when they brought the frozen body of Zack

In Session 4 he gave access to Maelle to the frozen body, and proved to be a bit of a sexist asshole about it.