Amber and Collei

When Collei first arrives in Mondstadt, she is extremely wary and suspicious of people because of her past experiences, preferring to be left alone and making her seem cold. Her pessimistic view of the world comes from the mistreatment and abuse she endured everywhere. She also has a rather low opinion of herself, pushing people away because she is "unclean" and says she is unworthy of their time. She was initially annoyed by Amber because of her cheerful and optimistic personality, but Amber shows her kindness by offering to help her find that something she lost, even insisting they are friends and protecting her from Kaeya's intimidation multiple times. The two continue to grow closer during the course of the manga and Collei begins to trust Amber, becoming less wary of people as her view of the world becomes brighter. When Amber protected Collei from Barnabas, Collei was touched by Amber's resolve and realizes that she too wishes to be able to protect others. After having her powers sealed by Cyno, she decides to leave with him to Sumeru in hopes of learning more about the world. By the time she meets the Traveler, Collei is shown to have matured whilst training under Tighnari and is now considerably more positive. She expresses great admiration for Amber, whose compassion deeply moved Collei to the degree that it influenced her behavior and hobbies. Inspired by Amber's benevolence, Collei tries to be very helpful and proactive in her Forest Ranger duties and strives to be as friendly as possible to everyone. Although she still has struggles with her literacy and Eleazar, she attempts to discard her past pessimism in favor of pushing forward and doing the best she can regardless.

She also developed a deep sense of empathy, extending even to the gods, whom she used to deem forsaken by, she now wonders if they too can feel just as helpless. She states that looking back, her extended hatred towards the world outside the Fatui was "childish." She also expresses guilt over her time in Mondstadt and is interested in apologizing. Despite her improved outlook, it is clear that Collei has yet to fully put her trauma behind her. Whilst no longer being bitter about it, Collei still finds it very difficult to open up to others about her past and avoids the subject when possible, as it brings back painful memories. Her introverted nature also leads her to occasionally spend time alone in a tree hollow, where she writes about any troubles or frustrations she may feel. Collei is somewhat of a bad liar, only being able to convince Amber on why she wanted to know about the Fatui's research. She is also prone to panic attacks and breakdowns, and especially hates being pushed or shoved around. Even just trying to touch her might cause extreme fear and discomfort, as shown when Paimon tried to playfully touch her the day they met for the first time in Sumeru. This shock apparently triggered a flare-up of her disease, causing her to be bedridden the next day.

Collei uses the medium female model. She has short, wavy light green hair that reaches her shoulders and purple, almost magenta eyes. Collei's A New Leaf outfit: Collei's hair is styled by a large hairpin resembling a flower with a black ribbon. She wears an earring with a large gem on her left ear. Collei's outfit consists of a green shawl with gold tassels worn over a brown dress that exposes her upper back, has detached sleeves, and a small black ribbon on the back with gold trinkets, black gloves that cover only her palms and leave her fingers exposed. Around her waist is a belt; her Dendro Vision, which has two long orange ribbons attached, hangs from the belt on her left side, golden brown open-toe stockings one leg at her thigh and the other reaching just above her knee, a golden band on her left thigh, black heeled boots with a fur trim that leave her toes exposed, and a long yellow scarf with gold details. Her appearance as a kid: Collei's hair as a kid was chin-length. When she first appeared, much of her body and face were covered in bandages. She wore baggy trousers, one that resembles a sirwal, and a tapper hat made from bandages. Tied around her hips is a green-orange cloth. Later, Amber loaned one of her old outfits to Collei to attend Ludi Harpastum in. Collei also wore a beige satchel, in which she store the collected Fatui devices. In Chapter 16, she appeared with a plain black shirt and a simple pair of shorts under a hooded cloak. She also wore an ushanka hat, a pair of gloves, and boots that reach up to below her knees. Lastly, she uses the same green-orange cloth and beige satchel from earlier.

Outrider for the Knights of Favonius, Amber is described as "a model for justice" by Kaeya. She fulfills her duties as an Outrider diligently, even though she's the only one left in the said platoon. She abides by the rules, except for when using her wind glider, having her gliding license revoked numerous times. She has an outgoing personality, as one might find her talking to strangers as if they're acquaintances. She is passionate in everything she does, may it be helping the citizens or purging hilichurls. She wishes to be as great as her grandfather, a once loyal defender of Mondstadt. Even after he disappeared, she still defends Mondstadt in his place.

Amber uses the medium female model. She has long dark brown hair, orange-gold eyes, and fair skin. Amber's 5-Star Outrider outfit: Amber wears a jumper-like outfit composed of dark brown shorts, a red top that has only a hood and sleeves, a white and brown top with the Knights of Favonius crest in gold on the front, red stockings, and white thigh-high boots embellished with gold linings and symbols. Amber's accessories include a leather belt with two small bags, and her Pyro Vision attached, gloves, a small belt on her right thigh, and gold-framed goggles. Her most distinguishing feature is the headband with the large red bow that rests on her head, resembling the shape of bunny ears. Additionally, her Vision has two red feathers attached below it.