The Killer7, also known as the "Smith Syndicate" or "Harman Alliance", is a group of assassins in the video game of the same name and who comprise the main cast of playable characters and associated members that assist the player.

The First Smith Syndicate was formed by Harman Deltahead in 1775, which is when Harman changed his name to Smith. The only other known persona in the Syndicate was Dimitri Nightmare. However, the Syndicate came to an end only three years later when Harman Smith split from both Dimitri and the "Deltahead" identity, which was the start of the multiple Harmans.

The Second Smith Syndicate was recruited almost two centuries later by Harman Smith, who revived seven personas in 1957 after their murders in exchange for membership in his organization. They quickly became the most famous and skilled assassins in the United States, receiving a large number of government contracts as a result. However, this came to an end of sorts when Emir Parkreiner murdered all six members in a hotel, after which he absorbed their personas (as well as that of Harman's) into himself and took on the identity of Garcian Smith.

Following this, the Second Smith Syndicate (now known as the "Killer7") returned to the government to resume their relationship, albeit one in which Emir failed to realize he was in fact now the entire syndicate. One of the organization's first jobs at this point was to kill Travis Bell, who subsequently joined the Killer7 as an informant, as did other targets (Susie Sumner and Kess BloodySunday), a duo hired to take care of Master Harman (Iwazaru and Samantha), and the man who sold out the original Smith Syndicate to Parkreiner (Yoon-Hyun) among others (the Mad Doctor, Kikazaru and Mizaru). The group continues to loyally work for the government for an indeterminate amount of time, likely years. Garcian establishes a relationship with Christopher Mills, his liaison with the government, working out a system of subtle communication via coded messages left on his answering machine, as well as a typical rendezvous point, the Seattle overpass.

When the "Heaven Smile" crisis breaks, the organization is assigned a number of counter-terrorism operations, first to investigate the cause of the problem, through which they learn that Harman Smith's rival and nemesis, Kun Lan, is behind the attacks. They are then sent to assassinate a foreign spy, Toru Fukushima, as well as a rival assassin, Jean DePaul, and end up learning more about the increasingly tenuous Japan-US relations in the process. They are then summoned by Andrei Ulmeyda to take him out at his own request. Following this, they are assigned a mission to stop an organ-trafficking program run by Pedro Montana and Dan's old partner Curtis Blackburn, and end up pursuing Blackburn to his personal residence in order to kill him. Yet another dangerous rival assassin group appears, this one called the Handsome Men; the Killer7 travel to the Dominican Republic to take down their apparent leader, Trevor Pearlharbor, and end up squaring off with them in Broadway, New York.

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HARMAN SMITH

Born in New Southampton, Wineport, Harman Smith is of Irish descent. He is sixty years old and handicapped.

(2) He is the Deltaheads' first born son.

(3) He is the leader of the world's most powerful group of assassins, the Killer7.

(4) Because of his power, he is known as the "God-Killer."

(5) He is the origin of the multiple personae.

(6) In his twenties, he worked as an agent for the Jim Townshend Survey Company. He has been an assassin ever since.

(7) His weapon is an armor-piercing rifle.

(8) He is better than Kun Lan at chess.

(9) In 2000, he was nearly killed by Dan Smith.

(10) In 2010, he was resuscitated.

GARCIAN SMITH: The man who killed the past.

Garcian Smith was born in Miami, near the border with Mexico. He is thirty-three years old.

(2) His nickname is "Garcie."

(3) He can see Heaven Smiles, using his powers of clairvoyance.

(4) His weapon is a handgun, with a silencer attached.

(5) He is not good at fighting; he is the weakest in battle.

(6) After recovering a body, he has to tap the button on the controller rapidly.

(7) He was "killed" by Harman in the past.

(8) Presently, he is Harman's faithful servant.

(9) Garcian is a sweet man who would not hurt a fly.

(10) He is the most important personality in the story.

(11) He is "the third eye."

(12) The Golden Gun rightfully belongs to him.

(13) He is also known as "the Bloody Heartland."

(14) His birth name and identity is Emir Parkreiner.

DAN SMITH: A tyrant in a three-piece suit.

Dan Smith was born in Detroit, Michigan. Of Irish descent, he is thirty-three years old.

(2) He is a tyrant—the true Hellion.

(3) His weapons are a revolver and the dreaded Demon Gun.

(4) He is best at eliminating the Duplicator Smiles with his Collateral Shot.

(5) He is a former agent of the Seattle Self-Defense Department.

(6) He and Mills have known each other for a long time.

(7) Curtis Blackburn was his mentor—and his mortal enemy.

KAEDE SMITH: She walks in a storm of blood.

KAEDE Smith was born in Portland, Oregon. Of Japanese origin, she is twenty years old.

(2) Her nickname is "Barefoot."

(3) She cuts her wrist to send out her "Bloody Shower."

(4) Mizaru serves her.

(5) Her weapon is an automatic pistol, with a scope attached. She reloads slowly.

(6) She is a formidable fighter with kicks.

(7) Her brother is a member of the Liberal Party.

(8) She was killed by her own brother, who received his orders from Matsuken.

(9) Her body was recovered by Garcian.

MASK DE SMITH: A profesional wrestler, the strongest.

Born in Albuquerque, New Mexico, the masked man is thirty-eight years old.

(2) In MASK De Smith, Luchadore meets Lancashire: Mexican wrestling with Anglo-Irish tactics.

(3) He is very strong, even without weapons, using his German Suplex and Headbutt moves.

(4) His weapons are two grenade launchers that fire normal shells, Shock shells, and Focus shells.

(5) He is the most destructive member of the Killer7.

CON SMITH: Sound hunter, speed star.

Of Chinese descent, Con Smith is blind at fourteen years old.

(2) He is known for his supersonic footwork.

(3) He has perfect hypersensitive hearing.

(4) His weapons are two automatic pistols.

(5) He is a big fan of the Handsome Men.

(6) He is very attached to Coyote Smith, and he hates Dan Smith.

(7) He whistles, when he is in a good mood.

COYOTE SMITH: The Hellion's nemesis.

Coyote Smith is Puerto Rican and twenty-eight years old.

(2) He is known as the Thief, and he is extremely athletic.

(3) He has the power known as "Deadly Jumping" for use in burglary.

(4) His weapon is a modified revolver.

(5) He loves to unlock heavy padlocks.

(6) In the past, he was killed by Dan Smith.

KEVIN SMITH: The taciturn killer

Born in England, Kevin Smith is thirty years old.

(2) He wears sunglasses.

(3) His weapons are a large knife and smaller throwing knives.

(4) When he turns invisible, he can bypass security systems easily.

(5) He is taciturn.

(6) He hates heights and loves dark places.

(7) His eyesight is weak.

(8) His shoulders are sloped, and he sometimes has bad posture.

(9) In the dark, his eyes are supposed to shine. However, this has not been confirmed.

SAMANTHA SITBON: Obedient, aggressively sexual, and cruel. "Don't worry about him. This gruff loves to play rough. You wanna have a little fun, too . . . ?"

Samantha Sitbon is a college student.

(2) She takes care of Harman for three days out of the week, for scholarship aide.

(3) In reality, she molests Harman.

(4) Sometimes, she teases Harman.

(5) She is mentally deranged.

(6) When Harman is awake, she completely changes into a loyal servant.

(7) She appears in the Pigeon's Letters.

(8) At the end, she obtains the name "SAMANTHA SMITH."