Beta

"Beta" (real name unknown) is a main character and an antagonist as well as a survivor of the outbreak in AMC's The Walking Dead. He is the second-in-command of the Whisperers and the right-hand man of "Alpha". He serves as the secondary antagonist of the second half of Season 9 and the whole of Season 10.

Overview
Beta is shown to be a sadistic, cunning, aggressive, psychopathic and highly analytical man who is devoted to the Whisperer way of life. He is completely loyal to his leader, Alpha, following her orders without question and respecting her decisions completely. Due to his large size and strength, Beta is a very dangerous opponent, capable of using excessive force to protect his group and is an extremely skilled fighter, being able to casually overpower Daryl during a fight. He has very fast reflexes, as he effortlessly grabbed Henry's stick when the latter tried to hit him. He is also extremely durable, shrugging off a stab wound and even surviving a more than two story fall down an elevator shaft after being tricked and shoved in by Daryl. Beta is shown to be quite capable of cold-blooded murder and was fully prepared to kill both Henry and Lydia on Alpha's orders, showing that he has no qualms about harming adolescents and nearly even broke Henry's arm. He appears to be a highly skilled tracker and strategic thinker as well which makes him a vital member of the Whisperers; with Lydia admitting to Daryl that he is the Whisperers' best.

He is more than willing to harm any Whisperer who poses a threat to Alpha and to keep the others in line, as he threatened fellow Whisperer Sean upon learning of his and Helen's disdain for Alpha's decisions and applauded Alpha for murdering them to remind the other Whisperers of her dominance. This shows that he will do whatever is necessary to preserve Alpha's leadership over their "pack". Despite this he does show respect for members who are committed to the Whisperer way of life as seen by him consoling a dying fellow Whisperer embracing the "change" about to happen to him. While Beta has no problem with killing, he doesn't seem to enjoy it either, as he openly expresses disdain towards Daryl for not handing over Lydia when he was after her, claiming no one else from his group had to be slaughtered as a result.

Location Unknown
Nothing is known about Beta's life prior to or as the outbreak began.

Post-Apocalypse
At some point after the outbreak, Beta joined and eventually became the second-in-command of a large group of survivors that would eventually become known as the "Whisperers", being second in power only to his leader "Alpha". The group discovered an ingenious way to be protected from attacks of the dead by killing and skinning them and wearing their skin in order to mask their scents and move freely among herds in order to attack other survivor camps and settlements. Interestingly, even at the safety of their encampment from walkers, Beta is always seen with his mask on whereas other Whisperers and even Alpha herself usually take them off.

Killed Victims
This list shows the victims Beta has killed:
 * Adeline (Alive)
 * Alfred (Alive)
 * Laura
 * Barbara (Alive)
 * Mikey (Alive)
 * Mary (Alive)
 * Chanting Whisperer
 * Rufus (Caused)
 * Alpha (Zombified)
 * Carol Peletier
 * Numerous counts of zombies and unnamed people

Relationships
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"Alpha"
Beta is fiercely loyal to Alpha and follows each and every one of her orders without question, no matter how small and menial or large and dangerous they may be. He is also very protective of her, demonstrated when he immediately seized Sean when the latter challenged her leadership, holding a knife to his throat. He often advises Alpha on critical matters, and she, in turn, often confides in him.

Sean
Beta and Sean had a poor relationship, since Sean challenged Alpha's leadership. In response, Beta immediately seized Sean and held him in place when Alpha murdered Helen, forcing him to watch.

Lydia
Beta and Lydia most likely don't have a very good relationship, given Beta's loyalty to her mother, and that he was willing to kill both her and Henry at Alpha's behest. However, he was still willing to follow Alpha's orders to retrieve her, and momentarily spared Daryl in order to try and gain information on where she was being kept.
 * "The girl. Where is she?"
 * —Beta to Daryl.[src]

Carl Grimes
Beta and Carl have a poor relationship. When Carl followed Alpha and Lydia, Beta tracked and eventually captured him. He had no problem with hurting, and even killing Carl if necessary.

Daryl Dixon
Beta and Daryl have an extremely hostile relationship. Upon being told that Beta is the strongest member of the Whisperers, Daryl confidently proclaimed he would kill him first. In their first interaction, Daryl fired a bolt at Beta, who shielded himself with a door. Not long after, Beta plowed through a wall and tackled Daryl, triggering an intense and lengthy physical battle in which both men were clearly determined to kill the other. Both men drew dual knives on each other, and Beta nearly shoved Daryl's throat into a buzz saw. Daryl eventually won the fight by tricking Beta and shoving him down an elevator shaft; however, Beta survived, and upon regaining consciousness was visibly angry, likely meaning that he will want revenge on Daryl.
 * "You and your people are nothing to me. Your world is already dead. All I want is the girl."
 * —Beta to Daryl.[src]
 * }
 * }

Season 9

 * "Guardians"
 * "Chokepoint"
 * "The Calm Before"
 * "The Storm"

Season 10

 * "We Are the End of the World"
 * "What It Always Is"
 * "Bonds"
 * "Squeeze"
 * "Stalker"
 * "Morning Star"
 * "Walk With Us"
 * "Look at The Flowers"
 * "The Tower"
 * "A Certain Doom"

Trivia

 * The term "Beta" denotes the second most dominant role or position in a particular sphere or group.
 * He most likely started using the name "Beta" when he became the second-in-command of the Whisperers.
 * Just like his comic book counterpart, Beta's signature weapon is a pair of large knives. A holster for these knives can be seen on his belt.
 * Beta demonstrates an extremely high tolerance for pain.
 * He displayed no signs of pain when he was stabbed in the chest with a shiv by Daryl.
 * He removes the shiv from his chest without any resistance.
 * He survives and stands back up after getting pushed down an elevator shaft by Daryl.