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Birth name:

Yoon Seung-ah




28 August 2537
Saeloun Seoul, Reynif


193 cm (6'4")


90 kg (198 lb.)

Armored height:

203 cm (6'8")

Hair color:


Eye color:


Military career


Halo Waypoint - UEG.jpg Unified Earth Government


UNSC-Navy-logo1.png UNSC Navy
Spartan branch.png Spartan

Years of service:

2546 –


Halo 5 Spartan Rank S.png Spartan

Service number:



SpartanStar.png SPARTAN-III Program

  • Gamma Company
  • Specialty:

  • Medic
  • Explosive ordnance disposal
  • Battles/wars:

    Battle of Paradiso

    Battle of Beimeni

    Requiem Campaign

    Battle of Kamchatka

    Subjugation of Earth


    Bronze Star ribbon.png Bronze Star
    Purple Heart ribbon.png Purple Heart

    Cquote1.png Be confident in everything. Cquote2.png

    Seung-ah-G218 (born Yoon Seung-ah; Korean: 윤승아; August 28, 2537) is a SPARTAN-III supersoldier of the Gamma Company.


    Early childhood

    A picture of Seung-ah at the age of 5 that her father still holds on to

    Yoon Seung-ah was born in Saeloun Seoul, Reynif on August 28, 2537. When she was at the age of five, her father, a marine by the name of Yoon Hyeon-ki, left the planet to fight the Covenant, leaving Seung-ah to live only with her mother until the year 2545. While Seung-ah and her mother were enjoying family time in their home city's park, the Covenant invaded Reynif. Seung-ah's mother was killed by Covenant infantry, but not before she ordered her daughter to hide in the park's pavilion building.

    Several hours later, Seung-ah was found by Petty Officer Dom-094, Sergeant Thomas Prado, and Lance Corporal Kylie Summers, who were also stranded in Saeloun Seoul. The SPARTAN called for evac, but a Phantom arrived at the park before any UNSC transport could, and deployed a team of six zealots. Dom-094 told Summers to take Seung-ah deeper into the building, while he and Prado would fight the elites. The SPARTAN was able to kill all six zealots, but suffered burns from a few plasma bolts. Prado, unfortunately, did not survive the attack. A D77-TC Pelican arrived soon after to pick up Reynif's last known survivors. Reynif was ultimately overrun, and subsequently glassed.

    Becoming a Spartan

    Seung-ah was conscripted as part of the SPARTAN-III Gamma Company. She was trained by Lieutenant Commander Ambrose, Senior Chief Petty Officer Mendez, and Petty Officers Second Class Lucy-B091 and Tom-B292 on Onyx. During the training, she was assigned to Team Dao, along with Henry-G066, Jim-G067, Jack-G068, and April-G182. Seung-ah was clumsier than the other trainees, and her combat performance relative to her peers never got much better.

    Ambrose, however, noticed Seung-ah's ability to inspire strength in even the most pessimistic of allies, and assigned veteran Hospital Corpsmen to train her to become a battlefield medic. Both Seung-ah's natural empathy and the skills she learned from her corpsmen instructors would prove to be valuable assets to any allied troops in her presence.[note 1] Two weeks after the SPARTAN-III's augmentation procedures, Team Dao was told that April suffered complications from the enhancements and could therefore no longer join them as a fellow Spartan.

    Battle of Paradiso

    Main article: Battle of Paradiso
    "I never thought you'd be so handsome."
    ―Seung-ah-G218, teasing Dom-094, upon seeing him without armor for the first time

    The Human-Covenant War left many civilians homeless. Paradiso was one of the newly-discovered habitable planets suitable for refugees. In the year 2556, Seung-ah-G218, along with Henry-G066 and Jim-G067, was sent to the planet with a set of refugees to ensure their safety from potential insurrectionist or Covenant attacks. They arrived on November 20, where they met up with Dom-094, who was already on Paradiso to watch over the first set of refugees.

    SPARTAN-IIIs Paradiso defense.jpg
    Jim-G067, Seung-ah-G218, and Henry-G066 fight off Covenant forces

    Just three days after the SPARTAN-IIIs' arrival, a small fleet of Covenant Loyalists led by brutes attacked the colony. The combination of the SPARTANs and a greater number of UNSC Army and Marine ground forces annihilated the Covenant ground forces. However, the brutes were able to successfully raid a camp that was not well-guarded, kidnapping none other than Seung-ah's very own father – Captain Yoon, his surviving men, and the civilians at the camp. The battle in space was also in the UNSC's favor, thanks to the UNSC's greater number of vessels compared to that of the Covenant, forcing the latter's remaining ship, a single battlecruiser, to retreat.

    Dom-094 meets S-IIIs.jpg
    Seung-ah-G218 greets Dom-094, when he meets up with the SPARTAN-IIIs after battle.

    The crew aboard the UNSC Frigg was able to track down the Covenant ship and its destination – a world controlled by a relatively small number of Covenant loyalist remnants. Vice Admiral Alexey Surkov ordered the Frigg and the majority of the Paradiso fleet to pursue in order to finish off the loyalist remnants and rescue the missing humans.

    Battle of Beimeni

    The information in this section or page is not up to date and is entirely subject to change. Outdated information remains on this page solely for archival purposes, should it be of use to Hyper Zergling in the future.
    Main article: Battle of Beimeni
    "He's dead, Jim."
    ―Seung-ah-G218 to Jim-G067, as the latter continues to mutilate a brute's corpse for his own amusement
    SPARTANs on Beimeni.jpg
    The SPARTANs arrive on the surface of Beimeni. From left to right: Jim-G067, Henry-G066, Dom-094, Seung-ah-G218

    Upon arriving at the planet the Covenant escaped to, Surkov's fleet faced another battlecruiser, with the escaping battlecruiser nowhere to be found. Shortly after the UNSC's arrival, the missing battlecruiser emerged from the planet's atmosphere, indicating that it had likely deployed its prisoners at the planet's surface. Surkov ordered the SPARTANs and a division of infantry to search for and rescue the captured humans.

    Seung-ah-G218 regeneration field.jpg
    Seung-ah-G218 activates her regeneration field.

    The Frigg's AI, Nótt, located the IFF transponders of the captured Marines, and the UNSC ground forces subsequently rushed to the location, which was a Forerunner tower. With the Spartans, led by Dom-094, spearheading the operation, the UNSC forces made their way to the prisoners, killing any enemy that stood in their way. Just before the SPARTANs could reach the prisoners, they arrived at the tower's control room, where Tisamenus, the chieftain leading the Covenant forces, waited for them

    The chieftain mocked the Spartans by telling them he had already killed one of their kind, even pointing to her armor he had on display in the room. Dom-094, immediately recognizing the armor belonging to Annie-003, nonchalantly ordered Henry-G066 and Jim-G067 to unload their weapons on Tisamenus. Dom-094 and the two other male SPARTANs, equipped with heavy support weapons, obliterated the chieftain long before he could reach them with his hammer.

    Among the chieftain's charred remains, Jim-G067 recovered his weapon, a Tartarus' Gavel. With their biggest threat eliminated, the Spartans proceeded to free the prisoners. Just before leaving the control room, Dom-094 activated the fail-safe detonation system of Annie-003's armor, demolishing pursuing Covenant forces and honoring his deceased former leader. The UNSC forces escorted the civilians to the nearest extraction with Jim-G067 in front, plowing through brutes and jackals with his new weapon. Once all UNSC forces evacuated the planet, Surkov ordered the orbital bombardment of the Covenant bases on the surface.

    UNSC Infinity

    Seung-ah-G218 Infinity.png
    Seung-ah-G218 defending the UNSC Infinity from boarding Covenant forces

    Since 2557, Seung-ah-G218 has been stationed aboard the UNSC Infinity as a part of its Spartan contingent. During the Requiem Campaign, Seung-ah participated in fighting against boarding Covenant and Promethean forces.

    Personality and traits

    Seung-ah-G218 is best known for her very friendly and sociable personality which often boosts the morale of her allies. Due to her relative lack of combat ability among the Gamma Company SPARTANs, Seung-ah initially had difficulty finding her place among her peers.

    Seung-ah's communication skills, however, was noticed by Kurt Ambrose, who assigned veteran Hospital Corpsmen to train her as a medic. Ambrose's decision proved to have paid off; Seung-ah had since gained a reputation of keeping almost all wounded allies alive long enough to receive proper medical attention, regardless of how terrible the not-immediately-fatal injuries are. Those who have been treated by her describe her as "an angelic, reassuring presence" or "giving off a soothing aura." Shortly after the Human-Covenant War, Seung-ah would also take a course on explosive ordnance disposal (EOD) in order to improve her ability to save lives. Although Seung-ah is inferior in combat when compared to her fellow Spartans, she herself is still a Spartan and is therefore a skilled soldier in her own right would easily outperform just about any non-augmented personnel of the UNSC Armed Forces on the battlefield.

    Because of Seung-ah-G218’s outgoing and friendly character, she inevitably got along with almost every other SPARTAN-III of the Gamma Company. Inevitably, with her time spent with Team Dao, she became very close friends with all of her teammates. Seung-ah considered April-G182 to be her best girl friend and was saddened when the latter was withdrawn from the team, knowing that she will likely never see her again. Seung-ah also looks up to Dom-094 and often tries to engage in conversations with him in order to learn more about the Spartan who saved her from the Covenant.

    Seung-ah-G218 is of Korean descent. Like her fellow SPARTAN-IIIs of the Gamma Company, she wore her hair close-cropped during her years as a trainee, but since after the end of the Human-Covenant War, she has grown out her hair, maintains it at a few centimeters past shoulder-length and wears it in a ponytail. Seung-ah is 193 cm (6'4") tall and weighs 90 kg (198 lb.), putting her slightly below average in height and making her quite slim for a SPARTAN-III.


    Seung-ah-G218 Air Assault.png
    Seung-ah-G218's first suit of MJOLNIR GEN2 armor

    In the Human-Covenant War, Seung-ah-G218 wore SPI Mk II armor. After the war, she was given access to MJOLNIR GEN2 armor, choosing to wear an Air Assault helmet, EVA body armor, Mk V pauldrons, Mk VI forearm armor, and Recruit leg armor. At the start of the year 2558, however, Seung-ah began wearing an upgraded set of armor, instead consisting of a Security GEN1 helmet and Indomitable armor with Erőd patterning.

    Not specializing in any particular field of combat, Seung-ah-G218 often uses an assault rifle (MA5C during the Human-Covenant War, MA5D after) or personal defense weapon (M7 during the Human-Covenant War, M20 after) as her individual weapon, although she has also used an M319 grenade launcher on many occasions. Seung-ah-G218 is also notable for often carrying stun grenades in addition to M9 fragmentation grenades. As a battlefield medic, Seung-ah-G218 always carries a health pack when deployed in an engagement, using its contents to temporarily treat wounded allies. In light of the recent conflicts, Seung-ah-G218 also began equipping her armor with an M2705 regeneration field plug-in in order to allow her to regenerate the shields of fellow SPARTANs and/or elites of the Swords of Sanghelios that are under enemy fire.


    • Seung-ah-G218's physical appearance is modeled after that of the singer and actress Yoona.
    • Seung-ah coincidentally shares her name with the actress Yoon Seung-ah, as Hyper Zergling had no knowledge of the actress upon the creation of this character.
    • Seung-ah-G218 shares the same numerals in her tag as her former teammate April-G182. This is entirely coincidental, as Hyper Zergling came up with the number 182 completely out of random and was not thinking of Seung-ah-G218's tag during his creation of April-G182.
    • An alternate-timeline version of Seung-ah-G218 exists in the Onyx Chronicles, which possesses continuity conflicts with the Platinum Annals Universe that Seung-ah-G218 officially resides in.


    1. The events described here take place in the Platinum Annals Universe. In the Onyx Chronicles, it is Aspen-B145 instead who takes notice to Seung-ah-G218's personality and personally seeks her out to train her as a medic.

    List of appearances