The Sniper (Downrange)

The Sniper is the antagonist of the 2017 horror thriller film Downrange.

He's an enigmatic and ultimately anonymous, yet deadly accurate and merciless serial killer who murders random travelers through a sniper rifle.

Personality
Very little is known about the sniper's personality since the latter doesn't speak a word in the movie and remains a sort of anonymous and distant, yet ultimately murderous threat. He's a complete psychopath with no senses of remorses for his acts of brutality whatsoever. He enjoys to tear apart his victims with his rifle, making them bleeding out slowly before giving the final blow. A huge sadist, he lets some of his victims run away before inevitably killing them.

Plot
A bunch of teenagers travels through some route when their SUV suffers a tire blowout. While changing the tire, one of them named Jeff is suddenly killed by a sniper rifle through a headshot. Then, the sniper shoots a pregnant girl called Sarah in her eye, prompting the four remaining survivors - Eric, Jodi, Karen, and Todd - to immediately take cover. The killer shoots a cellphone off a selfie stick when the trio behind the vehicle tries getting a signal to call 911. They attempt, and eventually succeed in putting the SUV to neutral so it can be moved, but the car rolls in the opposite direction until the sniper shoots out another tire and disables it. Panicked, Eric attempts to run toward nearby trees in the commotion, but the sniper shoots him in the ankle as well as in his leg. Eric survives on the moment but eventually passes out.

Some hours later, Todd sees a vehicle passing and attempts to warn them of the rampage, but is swiftly killed by the sniper. Then, the sniper proceeds to injure the male passenger of the incoming car; the female driver loses control and flips their car, ejecting their daughter in the backseat through a window. The father drags his wife and daughter behind their car while calling the 911. The sniper shoots the flipped vehicle’s gas tank. The resulting explosion kills the man and the woman. The sniper then executes their daughter.

After night falls, Keren and Jodi set fire to their SUV to create a smokescreen. Before they can run away, they witness an incoming police car with a sheriff, a deputy, and two police marksmen aboard. The sniper takes out one of the sharpshooters as well as the sheriff. The sheriff’s truck loses control. Keren makes a run for it in the smoke, but the sniper shoots her through her head.

Jodi regroups at the sheriff’s truck with the deputy and remaining marksman, but the sniper takes out the two men. Jodi then drives the truck to the sniper's position, and eventually manage to reach him while avoiding his shots. Jodi recovers the sniper's rifle and shoots him several times, killing him. However, when Jodi notices tally marks on the rifle enumerating his victims, including her five fallen friends, she becomes enraged; her final useless strike causes the gun to fire a bullet that tears through her throat, presumably killing her.

Trivia

 * Given his exceptional marksmanship, he might be a retired sociopathic soldier that enjoys hunting people with his rifle. This is further hinted by the tally marks on the rifle enumerating his victims, which clearly underlines his sadistic nature.
 * Alternatively, he might suffer from Posttraumatic stress disorder, which would stem from his war experience.
 * He killed eleven people (or twelve if we include the fetus of the pregnant victim), but his actual body count is likely much worse as he probably began to kill people in the middle of nowhere prior the movie's events.