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All Fiction Battles Wiki
Love… is not something to seek out… it is something to give.
~ Eugeo to Kirito


Eugeo (ユージオ, Yūjio) is the deuteragonist of the first half of the Alicization Arc. Eugeo is a child born in a remote village in the Human Empire of Underworld, where he was assigned the Sacred Task of felling a giant tree with his childhood friend Kirito. After a mishap during an adventure to the mountains resulted in his other childhood friend, Alice Zuberg, being apprehended by an Integrity Knight for breaking the Taboo Index, Eugeo's memories of Kirito were sealed by the administrators of the world, leaving him all alone. Eugeo spent the following six years focusing on his work to avoid thinking about Alice, until Kirito's return to Underworld led to Eugeo building the resolve to embark on a journey to become an Integrity Knight himself to rescue Alice.

Powers and Stats

Tier: 10-A | 9-B physically, higher with Sacred Arts, at least 9-B with Incarnation, 8-C with Enhance Armament, 8-A, likely 7-C with Blue Rose Sword's Enhance Armament | 7-C | Low 6-B, likely 4-B

Name: Eugeo, Eugeo Synthesis Thirty-two

Origin: Sword Art Online

Gender: Male

Age: 11 (Prologue 1), 17 (Chapter 1), 19 (Current)

Classification: Artificial Fluctlight, Former Giant Tree Cutter, Former Swordsman, Former Valet, Former Integrity Knight

Dimensionality: 3-D

Powers and Abilities:

Skilled Woodcutter, Accelerated Development (Leveling; Physical Stats, Abilities). Passive Reality Warping (via Incarnation. As with all VR avatars, especially in the Underworld, Incarnation grants all the ability to alter reality via their conscious and subconscious belief and willpower, and can be described as many people sharing a single dream, with greater control of Incarnation being likened to "lucid dreaming"). The primary applications of Incarnation are as follows: Empowerment, Statistics Amplification and Statistics Reduction (Belief in one's own strength will amplify one's own power, however the opposite can happen to the user as well if they are not confident in a matchup), Limited Law Manipulation (If enough people believe that something cannot happen, it will become impossible and vice versa), and Probability Manipulation (If an Incarnation user truly believes that they are weaker than their foe, even subconsciously, reality will be rewritten to ensure their defeat (and vice versa). If both sides are both completely confident in a battle, it will be a battle to see who's mental willpower is stronger than the other), Immortality (Type 8; Characters in the Underworld can't die as long as their fluctlight isn't destroyed), Unconventional Resistance to Soul Manipulation and Matter Manipulation (The souls in Sword Art Online are described as being made of quantum fields)

Same as previous, in addition to Superhuman Physical Characteristics, Skilled Swordsman (Trained by Kirito), Statistics Amplification (Sword Skills amplify the user's speed and power, with the downside of leaving a short post-motion delay afterwards (Though Skill Connect negates this downside)), Ice Manipulation (via the Blue Rose Sword), Life Drain (via the Blue Rose Sword), Magic & Creation (via Sacred Arts. Can create a spell or an object for almost any situation, so long as he knows the words used to arrange his thoughts, guide his emotions, and fuel his imagination to create said spell or object), Light Manipulation (via Sacred Arts), Darkness Manipulation (via Sacred Arts. Primarily used to search for objects), Ice Manipulation (Can create ice structures via Sacred Arts), Heat Manipulation (via Sacred Arts), Healing (via Sacred Arts), Elemental Manipulation (via Sacred Arts. Can use the elements or elemental objects of all kinds), Homing Attacks (via Sacred Arts. Can make his Sacred Arts home in on enemies), Transmutation (via Incarnation. Created the Red Rose Sword using his blood for Kirito), Possible Resistance to Law Manipulation (Broke the Seal of the Right Eye), Shapeshifting (Transformed himself into a sword)

Same as previous, in addition to Immortality (Types 1 and 2; Turned into a sword), Flight, Large Size (Type 0)

Invisibility (Enemies can't see him), Non-Physical Interaction (Able to interact with Subtilizer, a being made out of amorphous darkness), Non-Corporeal (Exists as a spirit)

Attack Potency: Athlete level (Able to deal chip damage to the Gigas Cidar, stating that it will take multiple more generations after him to actually fell the massive tree. Able to temporarily hold back Lizard Killer Ugachi for a few swings) | Wall level physically (Comparable to Kirito, and it has been stated multiple times that Eugeo was stronger), higher with Sacred Arts (Normally more powerful than standard physical blows. Superior to Kirito, as Eugeo has more practice in Sacred Arts), at least Wall level with Incarnation (Manage to catch Bercouli off-guard), Building level+ with Enhance Armament (Should not be inferior to Deusolbert's own Enhance Armament when used at full power. Required Alice to use her Enhance Armament to break free), Multi-City Block level, likely Town level with Blue Rose Sword's Enhance Armament (Should not be inferior to Kirito's own Enhance Armament with the Blue Rose Sword) | Town level (Destroyed the Sword Golem, which would at least have the Durability of a Divine Object, and clashed with Quinella's Sacred Arts, eventually slicing off one of her arms. Powered by Cardinal, who is Quinella's near equal) | Small Country level, likely Solar System level (Clashed with Dark God Vector)

Speed: Athletic Human (Can keep up with Kirito and Ugachi for a few swings) | Superhuman (After leveling up significantly from the goblin battle, Eugeo is able to compete with Integrity Knights) with Relativistic reaction speed (Is able to keep up with Kirito as an Integrity Knight, despite him wearing heavy armor and the former wearing a light coat. In Sword Form, he caught Quinella off-guard) | Unknown, likely Subsonic with Relativistic reaction speed (Comparable to Dark God Vector and Kirito with Enhance Armament and Release Recollection)

Lifting Strength: At least Average Human (Can barely carry the Blue Rose Sword) | Athletic Human (Lifted about 180 kg of straws with ease), Class G with the Blue Rose Sword's Enhance Armament (Should not be inferior to Kirito's own Enhance Armament with the Blue Rose Sword) | Unknown | Unknown

Durability: Athlete level (Tanked a hit from Lizard Killer Ugachi, however he was going to eventually bleed out) | Wall level physically, higher with Sacred Arts (Superior to Kirito), at least Wall level with Incarnation (Survived a non-lethal Enhance Armament slash from Bercouli), Multi-City Block level, likely Town level when blocking with the Blue Rose Sword (Divine Objects can withstand their memory release forms, all of which are on this level) | Town level (Destroyed the Sword Golem and clashed with one of Quinella's Sacred Art attacks, albeit he eventually shattered in the process. Completely ignored Quinella's barrier and cut off her arm) | Small Country level, likely Solar System level (Traded blow for blow with Dark God Vector)

Stamina: Virtually Infinite physically (Just like normal Virtual Reality Avatars, however the difference being that if one ran out of "stamina", they would begin taking damage to their Life), Vastly Superhuman mentally (Was able to stay conscious after being cut in half. Should be comparable to Kirito)

Range: Standard Melee Range when unarmed, Extended Melee Range with a knife hundreds of meters with guns | Standard Melee Range when unarmed, Extended Melee Range with a knife, hundreds of meters with guns | Extended Melee Range with his sword, several meters with Sacred Arts and Incarnation | Unknown, likely Planetary (Comparable to Dark God Vector)

Standard Equipment:

Intelligence: While academically unknown, Eugeo has a high combat intelligence and is a swordsman expert after being trained by Kirito, being able to surprise Bercouli— a war veteran with over three centuries of combat experience.

Weaknesses: Held back by rules and doesn't have free will by having to follow the Seal of the Right Eye | Most of the time, to activate Sacred Arts the user must chant out the words required to activate it. Sacred Arts require "spatial resources" to use, meaning that barren environments would lessen the effects of a Sacred Art. Sword Skills have a slight post-motion stun at the end of them in exchange for increased power (Though Skill Connect negates this weakness). Because of Incarnation's passive nature based on the imagination and willpower of the individual, at worst, if the user thinks a situation is hopeless or impossible to succeed, Incarnation will instead have a negative effect and make that situation true | Can only enter Sword Form through someone with extensive Sacred Art knowledge or is an admin themselves, such as Quinella and Cardinal.

Notable Attacks/Techniques:

Outside System Skills

  • Skill Connect: A technique that allows the user to chain together Sword Skills without having to worry about a post-motion stun. The technique works by first activating and releasing a Sword Skill, while at the same time positioning themselves during said Sword Skill into a pre-motion of another Sword Skill to chain them together. It is extremely difficult to do as it requires split-second precision to prevent a Sword Skill's post-motion stun from affecting the user.

Aincrad Style

Note: These are not all of the techniques in the style that Eugeo knows, but rather the ones he used most prominently.

  • Horizontal: Slashes horizontally.
  • Vertical: Slashes vertically.
  • Slant: Slashes diagonally.
  • Vertical Arc: Slashes vertically twice.
  • Sonic Leap: A Sword Skill that makes the user charge at the target at high speeds.
  • Meteor Break: A 7-hit Sword Skill that combines one-hand sword attacks with unarmed combat moves.

Balto Style

Note: These are not all of the techniques in the style that Eugeo knows, but rather the ones he used most prominently.

  • Head Sea: Also known as Back Rush in Sword Art Online, Head Sea is a Sword Skill that swiftly turns the user around 180-degrees to deliver a devastating slash. It is usually used when the opponent is behind the user.

Sacred Arts

Sacred Arts: «Sacred Arts» are System Commands in Project Alicization that residents of Underworld believe to be magic rituals. In reality, they are just words used to arrange thoughts and guide the emotions of the caster to make use of one's imagination power. Because of this, the imagination of the user may either improve or decrease the effectiveness of an art.

  • Perfect Weapon Control Art: The Perfect Weapon Control Art is a high-ranking Sacred Arts ritual that is used to boost the offensive power of a Divine Object-class weapon by linking with the true essence of the weapon. As all Divine Object-class weapons strongly inherit the properties of the object that served as its nucleus in the form of memories, the Perfect Weapon Control Art may be used to tap into the parameters inherited from the base material, thus increasing the power of the weapon in the form of special abilities. The ability acquired through the ritual depends solely on how the caster pictures the released form of the weapon. The first phase of the «Perfect Weapon Control Art», called the «strengthening» phase, is the partial awakening of the weapon's memories, which manifest as a new offensive ability for the weapon. The «Life» of the weapon decreases greatly every time the command is used and the power of the ritual is determined by the caster's ability to imagine the released form of the weapon. The second phase of the ritual, called the «releasing» phase, is a command that releases all of the memories of the weapon, unleashing all of its rampant power. Memories unleashed with this phase become uncontrollable to the caster and might even engulf the caster himself. For example, the «Perfect Weapon Control» art with the Blue Rose Sword is as follows:
    • Once the «Perfect Weapon Control» art is in effect, the Blue Rose Sword is capable of covering a large area in ice when sunk in the ground. Everyone within the area is then entangled in fast growing pinky-thick thorny ice tendrils, which quickly freeze their targets in blocks of ice. If the wielder then shouts the command "Bloom Blue Rose", an infinite number of large profound blue roses grow and leech the «Life» of the victims encased within the ice and turns it into Sacred Power, which is released into the area for use. According to Eugeo, these abilities are not meant to kill, but rather to trap one's opponent. The degree of power of these abilities also varies depending on which armament state the user has initiated. In the first, «enhancing», stage the sword can cover an area of ten meters in frost, where the ice tendrils then ensnare and freeze opponents, and can produce ice roses that drain «Life» at a gradual rate.
    • Upon entering its second, «releasing», stage, the sword sends out a rapidly expanding bluish white circle, which instantaneously freezes the surrounding area. In this state, both the freezing and «Life» drain abilities are greatly amplified, to the point where boiling hot water can easily be frozen solid, and the roses produced are actual blue roses, as opposed to the first stage's ice ones, which sap «Life» at a greater rate. However, maintaining these abilities requires great mental focus from the sword's user and, as with all «Perfect Weapon Control» arts, it uses some of the sword's «Life».


Incarnation: A secret skill passed down by Integrity Knights since ancient times, and one of the most important concepts in the Sword Art Online franchise. Incarnation refers to the ability to change the state of the world through pure willpower and imagination. For any other virtual reality world, it is a system glitch, usually activated in times of extreme emotion or during extreme brain activity, allowing closer access to one's Fluctlight, or soul, to temporarily change the world around them. For residents of the Underworld, it is a constant passive that dictates whether they succeed or fail in anything. The more confident one is in their abilities and the more of a positive reputation they have, the more the world shall bend in their favor. It is the power which Sacred Arts derive from. Its effects are versatile, as the power has been used to wield invisible blades, create swords from the user's blood, transmute objects, increase the chances of an event happening, and much more. However, the power of an Incarnation ability can be matched by another Incarnation ability, and the use of Incarnation is mentally exhausting, requiring a lot of concentration and energy to perform. If the user is in a state where their will is not strong enough, they become unable to use Incarnation. There are a limited amount of people who can use Incarnation to its full potential, and much practice and experience are needed to be able to use it. This ability is most prominent in the Underworld, as this ability is one of that world's core mechanics. However this ability has also been shown multiple times throughout the series before the Alicization arc.

Key: Beginning of Alicization/Pre-Goblin Fight | Post-Goblin Fight/Human Realm | Sword Form | Merged With Kirito


Notable Victories:

Notable Losses:

Inconclusive Matches: