A young Russian survivor of the initial infection, Alexei actually willingly came to Chernarus to single-handedly wipe out the plague.
Everybody is a threat.
Only family can be trusted.
All infected must die.
These are the rules that Alexei lives by.
Anybody who wrongs him or his family is an enemy for life, no matter what. Only spilled blood can get you back on neutral terms, but you will never be his friend.
He travels with Mysha & Colt Zoldyck from town to town, cleaning out the plagues of infected. If he sees another survivor, he will attempt to stalk them, sometimes going so far as becoming a sort of guardian angel. It reminds him of his old job, he does it as a sort of game. How long can he stay unnoticed? How well can he do his job?