Quetzalcoatl is a Rider-class Servant and a major deity from Aztec mythology, originally one of the four aspects of the Tezcatlipoca divine spirit, specifically the White Tezcatlipoca. As a supreme divinity, she is associated with wind, Venus, culture, harvest, and life, revered as a feathered serpent and a benevolent god who guided humanity toward prosperity through knowledge such as agriculture and fire. Her identity is also linked to the Mayan god Kukulkan and the legendary Toltec ruler Ce Acatl Topiltzin Quetzalcoatl, blending myth and history. She manifests as a tall young woman with slightly curly blonde hair and emerald eyes, wearing traditional Aztec-inspired attire adorned with orange and green feathers, including a prominent head plume. Quetzalcoatl possesses a generally benevolent and optimistic personality, expressing deep affection for humanity and a commitment to fostering communication and prosperity. She displays a bright and passionate disposition, believing firmly in the potential for a happy era even in times of crisis. However, as a divine being, her perspective operates on a scale beyond human comprehension, which can lead to severe judgments against perceived threats. She holds strong resentment toward Tezcatlipoca due to her mythological defeat and exile from the Aztec realm, and exhibits displeasure toward alcohol, which contributed to that defeat. Despite this, she occasionally consumes alcohol, resulting in drunkenness and unfiltered statements she does not recall afterward. She developed an intense fascination with lucha libre after witnessing the sport during a summoning, expressing enthusiastic endorsement of physical combat as a non-lethal means of conflict resolution and holding particular admiration for luchadores like Mistico. Her speech is typically graceful and polite but becomes excited and less coherent when delighted. During the Grand Orders, Quetzalcoatl was initially part of the Three Goddess Alliance in Babylonia, conquering the city of Ur alongside Jaguar Warrior. After encountering Ritsuka Fujimaru, she left the alliance to assist Chaldea in protecting humanity. This decision reflects her philosophical stance: while she loves humanity as a concept and believes in its growth, her affection for a Master is not personal but an investment in the "seed of mankind" they represent, viewing the Master as a vessel for nurturing human progress. Her mythological backstory includes defeat by Tezcatlipoca through deceit involving alcohol, leading to a scandalous incident and her departure from the Aztec world, often associated with Venus or the east. Legends tell of a promise to return, which influenced later historical events such as the Aztec interpretation of the Spanish conquest. In the Fate universe, she expresses lingering bitterness toward Tezcatlipoca, whom she criticizes as a "disgusting Divine Spirit" and a "shitty bastard spider." Her capabilities include association with the Noble Phantasm Xiuhcoatl and the Piedra Del Sol (Sun Stone). As a god of wind and the morning star, she possesses powers aligned with these aspects. Her relationships are defined by mythological and personal history, with animosity toward Tezcatlipoca being a recurring theme. She blames this god for her downfall and desires to avoid similar paths for her Master. Her interactions with the Master are guided by a protective and mentoring attitude, focused on ensuring they do not stray from a righteous path.