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You said his name is Kirito right? Wait what?! Where have I heard..........during the Beta Test!
~ Trinty X
Trinity X
Personal Info
Real Name Yuuki Trinity
Kanji 結城トリニティ
Romaji Yūki Toriniti
Age 19
Gender Female
Height 5`6
Weight Unspecified
Occupation Middle School Student
Family Yuuki Shouzou (Father)

Yuuki Kyouko (Mother)

Yuuki Asuna (Older Sister)

Yuuki Lamia (Younger Sister)

Klein (Boyfriend)

Player Profile
Display Name Trinity X
Kanji (Display) 三位一体
Romaji (Display) Sanmiittai
Epithet King of Knights (騎士の王, Kishi no ō)
VR Played SAO




ALO Race Spriggan
Occupation Clearer

Vice-Commander of Knights of the Blood Oath

Affiliation Knights of the Blood Oath

Team Yuuki

Base of Operations Floor 56
Status Alive
Appears In Sword Art Online

Gun Gale Online

ALFheim Online

Dragon`s Reign Online

Yuuki Trinity (結城トリニティ, Yūki Toriniti), and known as Trinity X (トリニティX, Toriniti X) or simply Trinity (三位一体, Sanmiittain) in «Sword Art Online» (SAO), «ALfheim Online» (ALO), «Gun Gale Online» (GGO), is the protagonist of the Sword Art Online: Trial By Fire Fanfiction. Trinity was chosen to be one of the one thousand beta testers for the closed beta of Sword Art Online, the first ever Virtual Reality Massively Multiplayer Online Role-Playing Game (VRMMORPG) for the NerveGear, and later joined the official version of the game. She thus became one of the 10,000 players who were trapped in Sword Art Online, where she remained a solo player for a short time, willingly taking on the role of a Beater to reduce discrimination against other former beta testers, as well as actively taking part in Boss battles as one of the Clearers. Trinity temporarily became a member of the Moonlit Black Cats after helping them safely escape a dangerous dungeon with Kirito assisting them, but returned to being a solo player when a fatal error resulted in the death of the other guild members. At some point in the game, Trinity became known as «Trinity X» (トリニティX, Toriniti X) due to people wanting to know her real name.


Trinity is blunt and honest as stated by Klein as well as super violent. She comes across as unsociable when she is actually pretty shy. She has social problems as mentioned by other people and is also very overprotective around Yui her younger sister`s Asuna`s adoptive daughter.


Real World / Sword Art Online / Project Alicization Avatar

Trinty X
She has long, light brown hair and green eyes. Her most common outfit, usually seen when not in a school uniform, is a green military uniform and matching beret. In the actual series, she can usually be seen in traditional Hungarian folk dress. The flower she wears in her hair, is from the person who proposed to her and that she preserved in resin that hardened the flower and kept it intact. It has been alternatively colored pink and yellow in the official artwork, though it is colored orange in the anime adaptation. Later in Gun Gale Online, the flower was changed back to pink.

Dragon`s Reign Online

Trinity`s original avatar in Dragon`s Reign Online was a Guardian Angel with straight, flowing black hair with a colorless white flower perched in her hair, with golden amber-colored eyes. She wore roman-style sandals, and had billowing white wings.

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