Matt -
Matt is the protagonist of the story. he is a little boy who knows little about himself, until he grows older. He soons finds out that he's a clone from el patron, a drug lord. Matt is loved and cared by a woman named celia. celia  knows that matt is a clone, so she doesn't like it when matt calls her his mom. later in the story matt hears kids out of his window and wants to play with them. so he brakes the window and lands on shards of glass. Then the kids take matt to a shack by their house and that's when they discover he's a cl0ne. He has a price stamp in his foot and it says "PRoperty of the el acran estate".

El Patron -
El Patron is the antagonist of the story. he wants to keep matt alive, but only for one reason. he wants matt to stay alive because when el patron loses an organ, he'll take one from matt. he lived to be more than 140-years old. el patron is a criminal. he kills, uses clones to his advantage, and he is greedy. he uses his clones to avoid the law. he kills his clones to have brand new organs and stay alive. matt happens to be one of his clones.

Celia -
Celia is the Big House cook and Matt’s caretaker. Celia is the mother figure in Matt's life, and protects him from the abhorrent truths about his purpose.
  • María and Emilia are the only children of Mr. Mendoza, who is an influential US Senator. El Patrón, who likes making powerful friends, frequently invites him to stay in Opium; consequently, María spends a lot of time in the Big House. She's around Matt's age and is his only friend, aside from Celia and Tam Lin. She treats him well even when no one else will, and unlike everyone else, doesn't see him as a filthy abomination. As they get older, they realize that they love each other. Emilia is revealed towards the end to be cruel-hearted and snobbish, showing no interest in her mother, feeling betrayed that her mother sticks up for "losers". She presumably died with her husband, Steven, during the funeral.
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  • rosa is a maid employed by the Alacrán Estate, who treats Matt horribly upon discovering he is a clone. She tortures and neglects him for six months when she is finally reported to El Patrón. For this offense, she is turned into an eejit who can only fetch horses for Matt (who pities her, despite her cruel treatment of him).
  • Esperanza is Mr. Mendoza's former wife, and María and Emilia's mother. She walked out on them when María was five, and is the author of "A History of Opium", a book about the atrocities of Opium. A copy of this makes its way into Matt's hands through Tam Lin. From a page in the back of the book about the author, Matt deduces that Esperanza is politically powerful. When he's escaping Opium, Tam Lin orders him to seek out María in order to find her mother, Esperanza, who could probably help Matt.
  • The Alacráns -
  • the alacrans are El Patrón's descendants. They include his grandson, Gustavo Alacrán, known to most as "El Viejo", his great-grandson Mr. Alacrán, and his great-great grandsons, Benito, Tom, and Steven.
  • Mr. Mendoza -
  • mr.mendoza is a U.S. Senator, and his two daughters, María and Emilia. Mr. Mendoza is one of El Patrón's friends and visits his daughters frequently. He probably attended the funeral and died with the other mourners.
  • Willum -
  • willum is the lead doctor at the Alacrán Estate, who frequently treats Matt for sickness and injury. He has a love-hate relationship with Rosa.
 
  • El Viejo is El Patrón's grandson and Mr. Alacrán's father. He is described by Celia as "the only good man in the house". He later dies of an unknown cause, for which a lavish funeral is held in his honor.
    • ~

  • Felicia is the drunken, psychopathical, and often drugged wife of Mr. Alacrán. She ran off with fellow opium farmer Mr. MacGregor, and comes home with a son, Tom, as a result. As Tom grows up, the two continuously plot Matt's downfall.
  • Tom is a rude, mean-spirited boy who is detested (with varying degrees of openness) by almost everyone at the Alacrán Estate. He has specific animosity towards Matt, whom he and Felicia frequently try to bring down.
  • Benito is one of Mr. Alacrán's children. He is described by Matt as "slightly nicer" than Steven and Emilia, which more or less proves to be true.
  • Fani is Benito's wife. She detests her husband, but was drugged and forced to marry him by El Patrón. She frequently drinks as a form of escapism. She may have been at the funeral and died, or could have possibly left Benito the moment his great-great-grandfather died, as she hated him and El Patrón's power no longer held over her, and she wouldn't have to leave Nigeria.
  • Felipe is El Patrón's son, who has died long before the time of the story's premise.
  • Mr. MacGregor is a drug lord in Opium and El Patrón's apparent best friend. He also invokes the use of a clone for organs, much to the shock of Matt and María.
  • Sister Inez is a nun at the Covenant of Santa Clara, where María and Emilia attend school.
  • Jorge, Raul, and Carlos are Keepers in Aztlan, who frequently mistreat the Lost Boys while they themselves enjoy lavish parties and the use of laudanum, a drug similar to heroin.
  • Furball is Maria's dog, who is later poisoned with laudanum by Felicia to frame Matt.
  • Keepers Keepers are the adult workers who watch over the Lost Boys. Most are mean and cruel to the Lost Boys.
  • Fidelito A skinny child also kept in hand of the Keepers, Matt's friend who help him escapeChacho- Another friend who helps Matt escape, Chacho is Matt's best friend in the plankton factory
  • Ton-Ton is a stuttering but dedicated Lost Boy who becomes very valuable to Matt in his attempt to escape the Keepers and resolve the crisis in Opium.
  • Flaco is another Lost Boy in the Keepers' care, and the oldest in the plankton factory.
  • Mr. Ortega is Matt's (ironically) deaf music teacher.
  • Tam Lin is Matt's bodyguard and father figure. El Patron gives Matt a choice between Tam Lin and Daft Donald, his other bodyguard; Matt sees a "glint of friendliness" in Tam Lin's eyes and chooses him. Matt quickly bonds with Tam Lin, who teaches Matt to climb treacherous rock-faces and live for days in the wild. He is also one of the only people who believes what Matt says about Tom. Tam Lin is later called back to El Patrón's side and leaves Matt with a cache of supplies in the hopes that when El Patrón decides to take Matt's heart for his own, Matt will escape over the nearby mountains into Aztlán to seek out the convent of Santa Clara where María lives and attends school. All of El Patrón's bodyguards are wanted criminals, and Tam Lin is no exception: he was a Scottish nationalist who laid a bomb for the British Prime Minister that accidentally killed a bus full of 20 children instead. As atonement, he drinks wine he knows El Patrón poisoned, along with all of the other Alacráns.
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