​Number One
Number One, a 14-year-old girl who was killed in Malaysia
Her Legacies include:
• Earthquakes - In the Fallen Legacies, she created seismic quakes while battling the Mogadorians.
• Telekinesis - Like all Garde, One can move objects with her mind.
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability.
Number Two
Number Two, or Maggie Hoyle, a twelve-year-old Loric girl who is known to have glasses, freckles and reddish brown hair, created an Internet message in an attempt to find the others, likely in desperation after her Cêpan was killed by Mogadorians. Because of this, the Mogadorians found and murdered her in London, England.
She was too young for legacies
Number Three
Number Three, or Hannu, a fourteen-year-old Loric boy, appears at the beginning of the first book being hunted down by the Mogadorians in Kenya and is killed soon after the death of his Cêpan. Three and his Cêpan are killed when the Mogadorians ambush their shack in the middle of the night.
Three's legacies included:
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability. Three used it to jump over the ravine in the book.
It is unknown what other legacies he had.

​Number Four
Number Four, or John Smith (formerly known as "Daniel Jones"), is 16-years old. John is Number Four in the sequence protecting the ten Lorien children living and hiding on Earth. He is described as being a fit, very attractive young man with dark blonde hair. He has three circular scars on his right ankle, symbolizing the three dead Lorien children, and a scar similar to the pendant all the Lorien children wear, signifying the charm that protects them. John falls in love with high school junior Sarah Hart in I am number four. In The Power of Six he develops feelings for number Six as well, although these subside in the third book, and his feelings for Sarah take over. Four also has a friend named Sam Goode who travels with him and Six in a search for his father who he believes to be a prisoner of the Mogadoriens. His Cêpan was named Henri, who dies at the end of the first book.
His Legacies include:
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability.
• Lumen - John's first legacy: The ability to produce fire, heat, and light from the users hands, and a resistance to heat, fire, and burns throughout the entire body. John's grandfather had this power.
• Telekinesis - Like all Garde, Four can move objects with his mind.
• Animal Telepathy - John's third legacy: The ability to communicate with animals. Although technically his first legacy He discovered this Legacy later, near the end of the book one.
• Precognition - Ability to see the future (John has shown this ability a couple of times, though it is unconfirmed whether or not this is one of his Legacies)
• Healing - He develops this legacy during the fight in The Rise of Nine. When Sarah and Ella were shot and dying, he concentrates on how badly he does not want Sarah or Ella to die and heals them.

​Number Five
Number Five is likely to be a girl. In I am Number Four, it is mentioned that a girl lifted a five-ton slab of concrete off a man in Argentina, and then she disappeared. She was under the alias Sofia Garcia. Also in I am Number Four, Henri said this line "They can't touch her until they've killed you first," which is a clue to what is Five's gender.
Number Six
Six or Number Six, also known as Maren Elizabeth (formerly "Sheila," "Kelly," and "Veronica"), is 16-years old. Her Cêpan Katarina names Six as a Warrior. She is perhaps the most developed in both battle technique and military strategy of the Garde we have met thus far, due to the need to fend for herself for the last three years, but is a close tie with Nine.
Six is described as very pretty, with long dark hair, olive-toned skin, hazel-grey eyes, high cheekbones, a wide mouth, and being two inches shorter than Number Four/John Smith. Both boys like her, though it is unknown who she prefers. She confessed that she liked both the boys and kissed John on his lips and Sam on his cheeks before she left.
Her Legacies include:
• Invisibility - Her first Legacy, developing in a Mogadorian dungeon, which she used to escape. In I Am Number Four, she uses it to find John in the school by sneaking around the Mogadorians. It can also be used to turn other people and objects invisible via touch. John's grandfather had this power.
• Telekinesis - Like all Garde, Six can move objects with her mind.
• Elemental Manipulation - The ability to control the four basic elements Earth, Fire, Water and Air, together they can be used to create, manipulate or control the weather. John's father had this power.
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability.

​Number Seven
Number Seven, or Marina, is a few months short of 18-years old and she is described as being tall with a lean build, with long dark hair and solemn, thoughtful eyes. She and Adelina, her Cêpan, have stopped moving around, unlike the other Cêpan-Garde pairs. They have lived at the Santa Teresa convent in Spain for the past 10 years. She becomes best friends with seven-year-old Ella in The Power of Six when Ella was brought to the monastery. The Mogadorians apparently located her long ago, as John finds a note saying that she was being "trailed in Spain", but due to the number-order, she could not be attacked until the charm was broken.
Her known Legacies include:
• Healing - She can affect humans, plants and Loric, including herself though it tires her a lot. She heals Héctor's mother of a degenerative incurable disease. When she uses this power, an icy cold sensation runs through her fingers and body.
• Night Vision - She has the power to see in the dark. This Legacy has not been officially named, as of the second book.
• Underwater Breathing - Marina discovered she could breathe underwater when she almost drowned in a lake.
• Telekinesis - Like all Garde, Seven can move objects with her mind.
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability. Although in the book she never used it.
Number Eight
Number Eight, or Joseph (also known as "Naveen" and "Vishnu"), is a boy living in the Himalayas of northern India. He's already developing powers, such as Telekinesis, as he was seen moving rocks with his mind. He had to learn how to control legacies on his own due to his Cêpan dying. Locals think he's the Hindu god Vishnu reincarnated, apparently because he can change his appearance into that of beasts and other beings. Crayton also mentions that he could be the chosen one who inherited Pittacus Lore's powers thus all of the legacies and can kill Setrakus Ra. It is said that Pittacus Lore had "All Legacies" and was able to take on Setrakus Ra. Eight was originally named Joseph and also possesses a heightened intuition which acts as a sixth sense.
• Telekinesis - Like all Garde, Eight can move objects with his mind.
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability.
• Teleportation - can move from place to place in an instant
• Hydro-locomotion- Walking on water
• Shape Shifting - able to transform his body into any creature he imagines\

​Number Nine
Number Nine, or Stanley Worthington, is roughly the same age as Number Four. Nine is one of the most powerful of the ten. He is rescued by Four after being held in captivity for around a year in a Mogadorian base in West Virginia, which incidentally is the same base where Six was imprisoned. Nine is described as taller than Four, and muscular, with long, dark hair. He's also very familiar and knowledgeable about the inheritance his chest contains. Displaying hints of an aggressive nature, coupled with a thirst for revenge against the Mogadorians. Nine's Cêpan's name is Sandor. it is revealed that when Nine and his Cêpan first arrived on Earth they tried moving around a lot sticking to small motels but were always found by the Mogadorians. Sandor then decides to use their immense wealth from the jewels that they brought from Lorien to live in luxury and hide in plain sight. Nine and Sandor were living in Chicago in a penthouse suite at the top of the John Hancock Center. In their suite Nine trains almost non-stop as he does not go to school. Nine had fallen in love with a girl named Maddy. Maddy however was working for the Mogadorians who had found Nine after one of their scouts disappeared in his area. Maddy was attempting to rescue her parents after they had been abducted by the Mogadores after her father "saw something he shouldn't have".
Nine uses a pipe-staff. His known Legacies include:
• Antigravity - Nine can walk on all surfaces, including but not limited to walls and ceilings as if he were upright.
• Animal Telepathy - The ability to communicate with animals. He discovered this at the end of The Power of Six, when Bernie Kosar/Hadley told him where to find Four's SUV. He also shares this Legacy with Four/John Smith
• Super Hearing - Nine can hear noises from a much farther distance than an average human or loric.
• Power transference - Nine appears to have given Sam the temporary ability to use his Loric objects. He had also transferred his Antigravity to Maddy and Four.
• Telekinesis - Like all Garde, Nine can move objects with his mind.
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability.
• Super Speed - Nine can run fast enough that he becomes a blur.

Number Ten
Number Ten, or Ella, is 11 years old (as of The Rise of Nine). Despite her young age, she already displays signs of enhancement in being unusually agile, quick and athletic for her young age. Ten was introduced as a new orphan and sent to the monastery Seven was living in in order to find Seven's chest. Ella has an unofficial Cêpan, Crayton, as she was too young to be assigned one on the day of the Mogadorian invasion of Lorien.
Her known legacies include:
• Enhancement - All Garde possess enhanced physical strength, speed, reflexes, endurance and durability.
• Aeternus - the ability to change between ages (but only ages that she had already lived through). Only one of the Ten Elders is supposed to have this ability; Ella is Loridas's successor.
• Telepathy - The ability to communicate with other Garde with Telepathy using her mind, even across continents as well as sensing others thoughts even mogadorians.

​The Cêpans
The Cêpans are former inhabitants of Lorien with no Legacies, resembling normal humans. Each Garde has a Cêpan who is charged with hiding, protecting and training their respective child as well as pass on the knowledge of Lorien and the Legacies.
Hilde/ Hessu
Hilde/Hessu is the Cepan of Number One. Her original Lorien name is Hessu. She was an older woman, in her fifties, and always was strict. They had to relocate from place to place some many times because of One's rebellious attitude. Hilde decided to leave America after One was arrested for shop lifting and headed to Malaysia. She was the one who woke One to tell her that the Mogs arrived. She was a good martial artist but was quickly overwhelmed and shot in the chest by a Mogadorian. Her death allowed One to awaken her Earthquake abilities. Hilde's last words were to run and survive. One described Hilde like a mother to her. The Mogadorians left Hilde’s body to rot in Malaysia.
Conrad Hoyle
Conrad is Number Two's Cepan. He and his Garde were living in Ireland but soon had to leave due to some unknown reasons. Then the General and his Mogs found them after Conrad killed a Mog scouting troop sent after him by the General and burned down their house in the Scottish Highlands. He headed for London, England and met Two at a safe house. The Mogs found his bus and started to attack, and despite Conrad having two SMG's with him, he is eventually killed.
Henri/Brandon
Henri (also known as "Brandon") is Cêpan of John Smith, or Number Four. He had a wife and a child on his home planet of Lorien, but he left them to protect John when Lorien was destroyed. He is John's caretaker and also trains and teaches him as his legacies form. His name on Lorien was Brandon. Henri is like a father to John since he was forced to leave his family behind on Lorien as well. Henri dies at the end of the first book, protecting John from the Mogadorians. In the second book, it is revealed from a letter that Henri wrote, that Henri knew Sam's father, Malcolm Goode, and that Malcolm was the whole reason for him and Four coming to Paradise. In the film adaptation

​Katarina/ Katar
Katarina is Number Six's Cêpan. She was more cool-headed than Six and tried to temper her volatile Garde. According to Six, Katarina was very thorough with her forgeries as well as with Six's training and that she had multiple lovers back on Lorien. When Six was 13 Mogadorians caught them both. The Mogadorians killed Katarina during her and Six's imprisonment in the Mogadorian base. She was tortured then killed in an attempt to force information out of Six.
Adelina/ Adel
Adelina is the brown-haired Cêpan of Marina, Number Seven. Her original Lorien name is Adel. After wandering aimlessly through Europe she entered the Santa Teresa convention Spain with Marina. Adelina had lost faith in their ability to restore Lorien and had grown accustomed to the religious life at the convent believing that one can save others through religion. As a result she often told Marina to "stop believing in fairy tales" and doesn't train Seven. After a Mogadorian attack she feels remorse for denying Marina's heritage and sacrifices herself to help Marina escape, being killed by a Mogadorian stabbing her in the heart.

​Reynolds
At the mention of his Cepan, Eight becomes withdrawn and avoids the topic, indicating that his Cepan is dead. It is revealed that Eight's Cepan is named Reynolds, and he and Eight were betrayed to the Mogadorians by Reynolds's girlfriend on Earth, Lola.
Sandor
Sandor is first revealed in The Power of Six at the end of the book when Nine tells Four (John) that his Cêpan was killed. He is further revealed in The Lost Files: Nine's Legacy where he revealed to have had a gift with working with technology as he creates endless amounts of drones and other machines that Nine fights in their practice gym, the Lecture Hall. He also says that he was young for a Cêpan and worked with older Loric engineers. He also had made a Mogadorian tracker covered with an iPod Touch case called an "iMog" by Nine. The screen shows a simple white dot in the center, which is Nine's location, and any red dots that show up on the iMog screen are Mogadorians. After he and Nine are caught and imprisoned, Nine mercy-kills Sandor to save him from further torture by the Mogs.

Crayton
Ella's surrogate Cepan, Crayton was assigned to Ella because she was too young to have an official Cepan, however the two seem to be close, Ella calling Crayton her 'Papa', Crayton helped to fight the Mogadorians when Seven left Santa Teresa along with Hector, Ella and Six, equipped with a briefcase of weapons including grenades, daggers and an assortment of guns stocked with bullets laced with Lorycide, claiming, "There isn't a shield here that can stop them!” When Seven first met Crayton she mistook him for a Mogadorian because he was always watching her and misread his clue concerning his book with 'Pittacus' in the title and the fact that he spoke to Hector. He first though tried to approach Adelina but she threw him out once she knew who he was. He decided in The Rise of Nine that they are going to find the boy in India, believed to be the Hindi God Vishnu reincarnated, and their Chimæras, before meeting up with Number Four. Crayton later dies in The Rise of Nine by a blast while trying to recover Eight's and Seven's chests. Except for Five, whose Cêpan's status is unknown, he is the last Cêpan. When this is stated in front of Crayton, Ella, Six, and Marina, everyone looks at Crayton and Ella. Ella hugs him, and starts to tear up. Later, when he is killed, she screams at Marina to heal him, even though she [Ella] knows that he is already dead.
Daxin
He is the original Cepan of Nine but due to Sandor tricking him and stealing his identification to be able to get out of the LDA, he was not able to go out and get Nine. He died during the invasion as a result.
Other Cêpan
• Number Three - The Cêpan of Number Three was killed in Kenya by a sword through their door, shortly before Number Three himself. In the film he is played by Reuben Langdon and was killed by a piken. He was said to be in his fifties.
• Number Five - The status of Number Five's Cêpan is unknown.

​
Humans
Sarah Hart​
Sarah Hart is John's girlfriend in the first book. Sarah is portrayed as an intelligent and extremely beautiful teenage girl with straight blond hair past her shoulders, ivory skin, high cheekbones, and soft blue eyes. Originally a cheerleader, she dated Mark, John's rival at school. After her parents realized what a bad influence Mark was, they sent her away for the summer. Upon her return, inspired by the sights she had seen during her time away, she quit the cheerleading squad and broke up with Mark. She is passionate about photography and animals. She became friends with John when they met and soon started a relationship. After John saves her from a house fire, she realizes he is not human and John is then obliged to tell her the truth. Despite knowing that he is not human, Sarah finds herself deeply in love with John and confesses it to him, which he does the same. John leaves her, so she doesn’t have to deal with the Mogs.
Sam Goode
Sam Goode is John's best friend. Sam is a devoted believer in aliens and alien conspiracies who believes that aliens abducted his father from his truck. He first suspects what John is, after they are attacked on the Haunted Hayride by Mark and his friends, but is convinced by John otherwise. However, when he sees John fight the three men in Athens who write the alien conspiracy magazine, They Walk Among Us he finds out he was right. He is a gangly kid with glasses, though they are not his — he explains to John that they belonged to his father, and he wears them in an attempt to connect with his father. He has a crush on Sarah's friend, Emily. During the battle against the Mogadorians, Sam saves John's life by killing one of the soldiers, and also saves Six by carrying her back to his truck after she is injured. He decides to accompany John and Number Six away from Paradise. His father, Malcolm, is one of the people who knew about the Loric and welcomed the Garde and their Cêpans when they arrived on Earth for the first time. Henri originally went to Paradise to meet with him and talk about the rest of the Garde, but found him to be long gone.

​Malcolm Goode
Malcolm Goode is Sam's father and one of the few people who know about the Loric. He is said to be one of the nine people assigned to help the Loric start their lives in earth and show its cultures and way of life. In Henri's Letter to John, it is said that fate is not the reason that they went to Paradise but because Henri was looking for Malcolm. Malcolm disappeared one day and Sam believed that somehow the aliens abducted him causing his disappearance. During the Search for Sam, it is found out that he had been experimented to extract information about the Loric that caused him to forget who and where he is. He was awoken by Adamus so he can perform the experiment.
Mark James
Mark James is the quarterback for the school football team and a bully. He is at first bitter when he sees that Sarah has begun a friendship with Four. After trying to hurt Four and Sarah whilst they are on a Halloween ride, Four defeats Mark and his friends and warns Mark to stop messing with them. Mark is sufficiently intimidated, and a truce is made. Four helps Mark when his house burns down during a party by saving his dogs. Mark discovers a video of Four saving Sarah and his two dogs from the fire and shows it to Henri. Henri then brings him to the High School and fights alongside Four against the Mogadorians. In The Power of Six, it is reveals that he adamantly denies that Four started the house fire and is willing to take the blame rather than place it on Four.

​Héctor Ricardo
Héctor Ricardo was the town drunk of Santa Teresa and Marina's only human friend. Héctor helps Crayton fight off the Mogadorians and protect Marina and Ella. A Piken killed him during the events in The Power of Six. He was grateful to Marina for healing his mother and helped her, Ten, and Crayton escape the Mogadorians.
Maddy
Maddy was a new girl in town when Nine was living in Chicago. She and Number Nine started a friendship after meeting at the Windy Wall and later became a couple. She had long black hair with bangs. She chose to go to a planetarium on their first date. On a second date, Mogadorians show up causing Nine to participate in a car chase while trying to escape them. Nine meets her at her house and spends the night. In the morning Nine wakes up surrounded by Mogadorians. They are taken to a base in West Virginia where she meets her parents. But the mogs kill her and her parents.
Wade
Wade is a surfer around sixteen years old whom Number One develops a crush on and stops training. He is rebellious like her and shoplifts. One chooses to shoplift some records to impress him and is caught and arrested by the police. He is one of the main reasons why One stops training and is found by the Mogadorians.
Devdan
Devdan is a friend of Eight mentioned in Rise of Nine. He is in the hands of the Mogadorians. He was used by Setrakus Ra to taunt Eight.
Lola
A woman that sold Eight and his Cepan Reynolds to the Mogadorians in exchange for a large bag of gold. However, the Mogadorians stabbed her in the back and then her "bag of gold" exploded on her.