York is a stoic, imposing nightstalker who tends to be protective of those who earn his trust. Having been made in a lab before the bombs while messing with different DNA mixtures, he was detained and thrown in stasis after cloaking and striking at a lab assistant. This resulted in him being released a while after the bombs, with him gaining an adult level of knowledge after waking and finding books with children's programming shows saved for intellect experiments nudging him to learn how read and rudimentally speak, both of which became helpful and honed when surviving around younger, lightly armed, or (preferably) high humans on the wasteland, especially trading things like jet for rations.

If he does find himself better off than hanging around jet dealers with a spike collar and maybe leather armor, he'll normally wear a brown leather jacket and a smooth brown collar, feeling a bit more comfortable with the collar on as it makes others feel safer and less likely to shoot him with the collar on. He can turn invisible as needed like some other nightstalkers.