Eli

Biodata

Feature	Details
Name	Eli Hall (伊莱) 2
Alias(es)	Billy Potter — the name Dumbledore identifies as belonging to Harry Potter’s missing younger brother 37
Species/Race	Human wizard 4
Gender	Male
Affiliation	Hogwarts School of Witchcraft and Wizardry; Slytherin House; founder of the Dueling Club; apprentice and heir of Nicolas Flamel 11 27 38 42
Occupation/Role	Hogwarts student, dueling instructor, potion-maker, alchemy apprentice, and prospective factory owner 25 28 49
Status	Active 49
First Appearance	Chapter 2: “Memory”

Power Progression

Stage / Realm / Level	Chapter	Notes
Exceptional raw magic	4	Levitat​es and crushes a large stone to intimidate Dudley, but the crude feat leaves him pale and drained.
Foundational spell control	8	Masters Lumos, including its brightness and extinguishing it at will; recognizes that intent, spell structure, and soul strength govern magical control.
Soul reinforcement	14	Uses Soul Devouring on a cockroach. His wand purifies the extracted soul into harmless white energy, which he absorbs to strengthen his own soul.
Advanced practical casting	20 26	Snape’s private instruction improves his magical control; Eli later dispels two third-years’ spells and disarms both Fred and George simultaneously.
Lethal original spell	21 22	Creates or instinctively casts Ultimate Death, a gray spell that drains a troll’s life instantly. The effort exhausts him into unconsciousness.
Magical Creature Animagus	42 43	Survives an unstable first transformation with the Philosopher’s Stone’s aid and becomes an Eastern-style phoenix Animagus, an unprecedented magical-creature form.

Background

Eli is the younger biological brother of Harry Potter in an altered timeline. During Voldemort’s attack on the Potter family, Lily Potter’s sacrificial Blood Protection Charm destroyed Voldemort’s body and split his soul into two fragments. One entered Harry, while the other entered Eli; Eli absorbed it and inherited Voldemort’s memories and magical knowledge 2.

On November 1, 1981, the Hall couple found him near a forest outside western London. After the police failed to locate his family, they adopted him and named him Eli Hall. Raised with affection and privilege, he kept his magical identity and origins hidden from Ernest and Doris Hall until his Hogwarts letter forced him to demonstrate magic 2 4.

Eli initially concealed his relationship to Harry, even from Harry himself. Dumbledore later revealed that he had identified Eli as the missing Billy Potter through an ancient Hogwarts quill, but agreed not to reveal the truth to Harry until the brothers were ready 37 38.

Appearance

Eli closely resembles Lily Potter, possessing her face and emerald-green eyes rather than James Potter’s features 3.

• Deep red hair reaching his ears 3
• Fair, delicate skin; he was described as resembling a porcelain doll when found by the Halls 2
• Tall but slender for his age, and often mistaken for a girl as a child 3
• Usually dresses neatly; formal clothing gives him the appearance of a young aristocrat 2
• In phoenix form, manifests as a large Eastern-style bird wreathed in golden-red flames and rosy clouds 43

Personality

Eli is intelligent, proud, sarcastic, and unusually mature. He often treats adults and classmates with dry irreverence, but he is calculating enough to hide important truths when necessary—particularly his origins, Voldemort’s memories, and his Dark magic research 2 10 30.

His strongest positive trait is protectiveness. He defends Harry from Dudley, repeatedly shields Harry, Ron, and Hermione during the troll attack, and defines his future strength as a means of protecting his family and companions 4 21 38. He also rejects Voldemort’s offer of power during the confrontation beneath Hogwarts 36.

This protectiveness is tempered by recklessness, pride, and growing moral detachment. Eli uses lethal spells when threatened, consumes souls to strengthen himself, and conducts anatomical experiments on an attacker’s corpse without remorse 14 29 30. He recognizes that his magical output is dangerous, but his pursuit of control and strength repeatedly leads him into forbidden or hazardous situations 15 16.

Abilities & Skills

Magical Capacity and Spellcasting

Eli possesses magical reserves far beyond those of ordinary children, which he attributes to his unusually strong soul and the Voldemort soul fragment within him. His raw power can make ordinary spells catastrophically strong, but it also threatens to outpace his control 8 13.

• Produces unusually destructive results with basic spells, including Lumos, Reducto, Incendio, and Petrificus Totalus 7 10 15
• Can cast some spells silently, including a color-changing charm used on Scabbers 10
• Uses defensive and control magic effectively, including Protego, Wingardium Leviosa, Incarcerous, and Expelliarmus 20 26 36 48
• His excessive output causes exhaustion, headaches, unstable Transfiguration, and repeated collapses after major battles 13 15 22
• Has an unexplained ability to sense differences in magical power, allowing him to distinguish Fred and George Weasley 23

Soul Magic and Mental Defense

Voldemort’s memories give Eli access to dangerous soul-related knowledge. He considers strengthening his soul essential because it must be capable of controlling his rapidly growing magic 8.

• Soul Devouring — extracts a target’s soul; Eli’s wand purifies it into harmless white soul energy before he absorbs it 14
• Uses animal souls, particularly Acromantulas, to strengthen himself while avoiding the legal consequences of harming humans 16
• Extracts memories through Legilimency, though his skill initially provides only limited information 29 30
• Resists Dumbledore’s attempt to probe his mind through the strength of his unusual soul 22
• One attempt to use Soul Devouring on an Acromantula initially fails, suggesting that not every target yields usable soul energy 14

Parseltongue

Eli can understand and speak to snakes because of Voldemort’s soul fragment 6.

• Secretly communicates with and adopts a black snake named Dogdan 6
• Conceals the ability because of its association with Salazar Slytherin and Voldemort 6

Combat Magic

Eli is an exceptionally capable first-year duelist, relying on superior magical force, strong defensive instincts, and increasingly refined control.

• Defeats multiple older students, including pairs of fifth-years, to establish his authority as Dueling Club president 34
• Uses Sectumsempra, taught by Snape, to counter an ambusher in Hogsmeade 29 30
• Kills an Acromantula with Avada Kedavra in a fear-driven confrontation 14
• Creates Ultimate Death, a gray life-draining spell capable of killing a troll instantly 21 22
• His strongest attacks remain physically taxing and can cause collateral damage, as when his amplified Incendio devastates part of the Forbidden Forest 15

Transfiguration and Animagus Transformation

Eli’s photographic memory, powerful soul, and anatomical studies make him exceptionally suited to Transfiguration 13 29.

• Transfigures a match into a detailed silver needle during his first lesson, though the result later fractures when his magic surges 13
• Successfully transforms a cup into a living toad, earning McGonagall’s permission to study Animagus magic 27
• Publishes three papers in Transfiguration Today and wins its Most Promising Newcomer Award 31
• Becomes a phoenix Animagus after a near-fatal ritual supervised by Dumbledore, McGonagall, and the Flamels 42 43
• Can shift freely between human and phoenix forms and create clothing from his transformation flames 43
• Keeps his phoenix form unregistered and secret with Dumbledore’s support 43

Potions, Alchemy, and Invention

Eli applies chemistry, standardized measurement, and Muggle industrial concepts to magical potion-making 9 49.

• Develops proprietary potion formulas through precise experimentation 9
• Brews and sells twenty bottles of lethal Necromantic Potion for 6,000 Galleons 9
• Receives private Potions instruction from Snape, whose training greatly improves his magical control 20
• Studies alchemy under Nicolas Flamel and is entrusted with the Book of Abraham the Jew 41
• Designs magical circuits and automated work units for a potion-production assembly line 43
• Uses the completed line to produce high-quality restorative potions at industrial scale 49

Anomalous Apparition

When Ocluse attempts to murder him with the Killing Curse, Eli involuntarily Apparates from Knockturn Alley to the Leaky Cauldron and brings Ocluse with him. The event remains unexplained 10.

Equipment / Weapons / Items

• Yew wand with Thestral tail hair — chosen at Ollivanders; resonates with Eli as an extension of his body and possesses a soul-purifying property 5 14
• Chevrolet — a lively black owl selected from Eeylops Owl Emporium 6
• Dogdan — a black snake Eli adopts after discovering it is hungry; his ability to speak Parseltongue enables their bond 6
• Undetectable Extension Charm bag — a palm-sized bag from McGonagall with storage equivalent to several wardrobes 6
• Book of Abraham the Jew — Flamel’s ancient alchemical text, entrusted to Eli as a future preserver of its teachings 41
• Felix Felicis — gifted by Snape after Eli’s academic success 31
• Fourth-Dimensional Pocket — used to transport the machinery for his potion factory 49

Relationships

• Harry Potter — biological older brother, though Harry remains unaware of their relationship. Eli protects him, mentors him in combat magic, and promises to stand with him against Voldemort 4 25 38.
• Ernest and Doris Hall — adoptive parents who raised Eli with affection and respect for his independence; they accept his magical identity after his demonstration of levitation 2 4.
• Albus Dumbledore — mentor and source of mutual suspicion. Dumbledore discovers Eli’s identity, tests his intentions, supports his phoenix secrecy, and helps establish his potion factory 22 37 43 49.
• Nicolas and Perenelle Flamel — alchemy mentors who accept Eli as their grandson and heir. Nicolas teaches him alchemy and supports his industrial ambitions, while Perenelle is openly protective of him 38 41 42.
• Minerva McGonagall — Transfiguration mentor who recognizes Eli’s ability, supports the Dueling Club, supervises his Animagus studies, and praises his academic work 13 27 29 43.
• Severus Snape — harsh private Potions instructor. Snape insults Eli constantly but provides advanced knowledge, magical-control training, restorative potions, and access to spells such as Sectumsempra 20 23 30.
• Draco Malfoy — roommate, rival, and uneasy friend. Their relationship shifts between jealousy, conflict, reconciliation, and loyalty; Draco ultimately shields Eli from Voldemort’s attack 12 23 36.
• Ron Weasley and Hermione Granger — close friends and members of Eli’s training group. Ron contributes tactical instincts and loyalty, while Hermione challenges Eli academically and helps him survive magical trials 21 25 26 36.
• Fred and George Weasley — initially dismissive of Eli, then become his students after he defeats them in a duel. They later support his Dueling Club and treat him as a fellow troublemaker 16 26 34.
• Firenze and Ronan — centaur allies who name Eli an honored guest after he saves their tribe from Acromantulas; Ronan later protects Eli’s identity from Dumbledore 15 16.

Story Role / Major Arcs

Protector of Harry

Before Hogwarts, Eli confronts Dudley Dursley and forces him to stop bullying Harry. This begins his role as Harry’s protector, even while he keeps their biological connection secret 4.

Slytherin Outsider

Eli expects Gryffindor so he can remain with Harry, but the Sorting Hat places him in Slytherin. He rejects Slytherin blood-status prejudice while maintaining friendships across House lines, making him a disruptive presence in both Houses 11 13 20.

Forbidden Forest Campaign

To strengthen his soul, Eli secretly hunts in the Forbidden Forest. His intervention in the centaurs’ war with the Acromantulas earns their alliance, but his uncontrolled Incendio also devastates the forest and leaves him unconscious 14 15 16.

Dueling Club Founder

Eli trains Harry, Ron, and the Weasley twins, then founds the Dueling Club under Flitwick’s supervision. He establishes his leadership by defeating challengers from multiple years and turns dueling practice into a major Hogwarts activity 25 27 34.

Philosopher’s Stone Trial

Eli joins Harry, Ron, Hermione, and Draco in passing the protections around the Philosopher’s Stone. He acts as the group’s principal magical defender, rejects Voldemort’s offer of power, and fights Quirrell alongside Harry and Draco 36.

Flamel Apprenticeship and Phoenix Rebirth

After Dumbledore exposes his identity, Eli becomes Nicolas Flamel’s apprentice and heir. During the summer, he studies alchemy, completes his Animagus ritual, apparently dies in phoenix fire, and is reborn as a magical-creature Animagus 38 41 42 43.

Potion Factory Project

Eli pursues financial independence and preparation for Voldemort’s return through automated potion production. Dumbledore returns a Potter family shampoo factory to him, helps secure its site, and supports its conversion into a protected restorative-potion factory 48 49.

Notable Quotes

“My strength will forever be an umbrella shielding those by my side!” 38

“Killing Voldemort takes more than just talking about it.” 25

Trivia

• Eli received an invitation to Eton College before revealing that he expected to attend Hogwarts instead 2.
• His first attempts at Lumos were so bright that he nearly blinded both himself and Tom, the Leaky Cauldron’s owner 7.
• He barely passes History of Magic through guessing despite earning full marks in Potions, Charms, and Transfiguration 34.
• Eli’s phoenix form is secret, unregistered, and considered by Dumbledore to be beyond ordinary magical-creature classifications 43.