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Sienna Khan was a character mentioned in "The Next Step" and introduced in "Dread in the Air". She was the High Leader of the White Fang after Ghira Belladonna stepped down until she was killed by Adam Taurus, who usurped her role after covering up her murder, claiming that a Human Huntsman attacked and killed her.
Sienna was a female, Bengal tiger-based Faunus with orange eyes, dark complexion and wild black, chin-length hair with an asymmetrical bob style. Her Faunus trait manifested as an extra pair of ears, and her body was adorned with numerous tattoos resembling tiger stripes. She wore four golden earrings on three of her ears, one each on her Human ears, and two on her left Faunus ear as well as a small jewel on her forehead.
She was seen wearing a form-fitting black dress with light green accents on the rims of the outfit; the dress left most of her back open, had two long splits on the side which revealed a pair of black shorts, a shorter split in the front and a small squared keyhole. Over the dress, she wore a back-revealing red cape with gold accents, as well as a green waist cincher with red rims that had a black belt over it, which fastened a green pouch on her right hip. Aside from that, she wore black stockings in conjunction with green sandals that had red laces which were tied to her calves, as well as a black elbow length fingerless glove on her right hand.
Sienna's previous attire was similar to her original except she wore white pants with black thigh length boots and she lacked her cape. She also wore a pair of matching metal wristbands and an orange string band on her right arm.
Sienna was one of the White Fang's first advocates for using fear and violence to overcome Human prejudice towards the Faunus. She initiated this method, believing it necessary to make mankind regard them with fear to demand respect. Having personally created this change and becoming the leader of the White Fang, she was strong and willing to be violent, but not to the extent of hurting her cause on a global scale, which she believed the Fall of Beacon had done. She, however, greatly underestimated the descent into violence and hatred towards Humanity that many members of the White Fang such as Adam, the Albain brothers and her own bodyguards were taking that caused them to turn on her as they deemed her too soft towards Humans.
She was easily in touch with her anger but did not let it overrule her judgment. She let herself listen to Hazel Rainart briefly and also did not outright punish Adam for his misdeeds, instead choosing to lecture him.
While not as prejudiced towards Humans as Adam and many other members of the White Fang, Sienna still had a degree of disdain towards Humanity as she was unconcerned about the Human lives taken by Adam. She encouraged him on his way after he accidentally killed one and only chastised Adam when he went too far. In this, however, she cared for the damage Adam's excess caused to her cause rather than the victims of his actions.
Her strength and independence were also notable after it became clear that Adam had committed a coup, intending to overthrow and replace her as High Leader. She stated quite clearly that she would not simply follow him, which was predictable enough in her character that Adam had already decided to kill her.
Powers and Abilities
As former High Leader of the White Fang, Sienna had a great influence over the organization. She was also fairly agile in combat and was able to easily defeat AK-130s and Human guards alike. Additionally, her genealogy as a Tiger Faunus is described as being powerful.
- Main article: Cerberus Whip
In battle, Sienna was shown wielding Cerberus Whip, a chained whip that had three blades attached to the end. The blades were sharp enough to cut apart AK-130s with ease and each had a Dust crystal of differing types, such as Ice. The blades could also be detached from the chain to be used as projectiles.
As revealed in RWBY: Amity Arena, Sienna's Semblance is called Grudge. Her Semblance's "grudge" will activate on foes that have their Aura weakened or broken, making her stronger, faster and more vicious when going in for the kill. 
Five years before Blake Belladonna became a student at Beacon Academy, Sienna was appointed High Leader of the White Fang after Ghira Belladonna stepped down. Sienna stated that she believed in violence for some time prior to radicalization.
During a meeting arranged by Adam, he is seen kneeling before Sienna and begging her to invade Haven Academy. Sienna states that he should be trying to beg for forgiveness, berating him over the ramifications the White Fang is faced with due to their part in the Fall of Beacon and for leaning on the support of Salem's Inner Circle when their knowledge of them is very limited and the group is primarily comprised of humans. When Adam reveals that he brought Hazel as a representative to meet her, she is briefly livid before relenting. Unable to be persuaded by Hazel, Sienna asserts her decision to not invade Haven Academy and orders her guards to apprehend Hazel and Adam. But the guards do not comply, and Adam reveals that he has staged a coup against her, as more Faunus enter the room and train their weapons toward her.
Dethronement and Death
Not backing down, Sienna told Adam that she would never follow him and was impaled mid-sentence in the abdomen with Wilt. Using the sword to lift and bring her closer, Adam thanked Sienna for her service to the White Fang and told her that he is the High Leader now. After her death, Adam then instructed the mutineers present that Sienna was to be considered a martyr and to inform the rest of the White Fang that a Human Huntsman assassinated her, now taking Sienna's throne as his own. This act earned Adam contempt from Hazel, due to Adam omitting that he plotted a coup and Hazel seeing Sienna's death as unnecessary. Adam paid no mind to this, eager to wage his war on Humanity which Sienna would have hindered.
- "Sienna" refers to a reddish shade of brown, while Khan translates as "sovereign", "king", or "military leader", in a number of languages.
- She may allude to Shere Khan from Rudyard Kipling's The Jungle Book, which is all the more evident as the predecessor, Ghira, may allude to Bagheera from the same story.
- Shere Khan is a tiger, and Sienna is a tiger Faunus as indicated by her ears and stripes.
- Her last name is Khan.
- Sienna was added to the "Volume 6 Adam Character Short" to give her more screen time as she was a well received character and a lot of people were disappointed by her death.