Lars

Lars is a feral vampire and an unfortunate lab rat for the National Bureau of Normalcy. An early candidate for their cryptid-weaponization program, whatever unknown experiments he was subjected to thoroughly broke his mind, leaving him little more than a raving, bloodthirsty lunatic.

Personality
Lars's original personality is unknown, as the first time we see him is after his escape from the NBN. Driven to madness by the atrocities committed against him by Bureau scientists, he mostly speaks in nonsensical monologues and non-sequiturs. Despite this, he is clearly still capable of some rational thought, as shown when he lures Daisy closer to him. His sole objective is to feed and he will pursue potential prey with frightening determination, even going outside in broad daylight in order to hunt. He seems to have reverted to somewhat animalistic behavior and is shown at one point crawling on all fours.

Background
At some undetermined point prior to 1945, Lars was captured by the National Bureau of Normalcy. There, scientists subjected him to unknown brainwashing procedures in an attempt to turn him into an obedient killing machine. These experiments permanently damaged his brain, turning him feral.

Escape from the NBN
In 1945, Lars escapes from the Bureau and finds his way to UT's campus. There, he's discovered by Patricia, who subdues him and ties him up in the studio, hiding him behind a curtain. Later, Lars tricks Daisy into removing the curtain after claiming to be an injured student. The feral vampire tries to convince Daisy to free him but ends up succumbing to his bloodlust, lunging at her and scaring her away. He then uses the pair of scissors that Daisy dropped to free himself.

After searching the station for prey, Lars' hunger drives him outside, despite his lack of protection from the sun. There, he finds Nik. Sneaking up behind the exchange student, he pounces on him and starts drinking his blood. He is seen, grinning, standing over Nik's body as Rich, Daisy, and Molly flee. Although we don't see what happens next, given the fact that Nik wasn't killed, it stands to reason that Bureau agents collected Lars before he could finish feeding on him.

Following Lars' recapture by the Bureau, he is seen bound to a chair in a dark room with two agents. He begs them not to hurt him, and they respond by retrieving a pair of pliers, at which point he begins screaming.

Relationships
Nik: Lars is the vampire who turned Nik. Although this was clearly a monumental occurrence for Nik, it doesn't seem particularly momentous for Lars, who was just looking for anyone to feed on. Furthermore, Nik's resurrection as a vampire was likely unintended, as, given his all-consuming thirst, Lars likely meant to drain the student dry. Why he didn't is unknown.

Notes and Trivia

 * Although the character is identified as "Lars" in both the episode's script and end credits, he is never referred to by name during the episode, with most characters simply referring to him as "the vampire."
 * Geld was cast for the role the night before the shoot.