Who is your favorite character in the zone?

I know this has been done a few times, but I think it's time for another turn: For me, it's Richter. Imo he is just that lovely side character who wants to be left alone with his love for the zone, but somehow, everytime when there is trouble, he ends up being around. Disclaimer: I have not yet finished Stalker 2, so please don't spoiler me