- "The world embraced vampires with open arms, Buffy. Now it's got to learn to deal with them without crying for the nearest slayer. You're one of the strongest girls I know. The people who hire us needs our help... even if they're not getting chased by some Big Bad with an unpronounceable name."
- ―Kennedy to Buffy Summers[src]
Kennedy was a Slayer and ally of the Scooby Gang. Activated in 2003, she fought at the Sunnydale Hellmouth during the battle against the First Evil and afterward continued to work for the Slayer Organization. Kennedy was in a romantic relationship with Willow Rosenberg, having helped her move on from the death of her previous girlfriend, Tara Maclay. Following her break-up with Willow, she found her calling as a bodyguard for clients as well as giving other Slayers a purpose after the end of magic.
Kennedy came from a wealthy New York family with a summer home in the Hamptons and she had one sibling, a half-sister. An out-of-the-closet lesbian, Kennedy claimed she knew about her sexuality since the age of five after watching Gone with the Wind and wanting to "sweep Scarlet off her feet". At some point in her life, Kennedy was identified as a Potential Slayer and was trained to use weapons, at least from the age of eight.
- "Come on, Red. Make it happen."
- ―Kennedy whispers words of comfort to Willow before she starts the spell to activate the Potential Slayers[src]
Kennedy fought alongside Buffy and the other Potentials in the final battle against the First's army of Turok-Han. In this battle, Willow activated every Potential around the world, including Kennedy, causing her to become a Slayer. She survived, having quickly taken on her new life as a Slayer, remarking "I could get use to this".
As a Slayer
- "I could get used to this."
- ―Kennedy after being activated as a Slayer[src]
Following the battle with the First, Andrew Wells claimed that Kennedy and Willow continued to be a couple and were then living in Brazil together. At some point, Kennedy suffered a month-long mystical death and she and Willow started taking their relationship more slowly. She confessed to Willow her concerns that Willow was keeping her away from her friends due to shame, which prompted Willow to reveal that she blamed herself for Tara's death by keeping her close to Buffy and therefore danger. Willow stated that she refuses to let that happen to Kennedy. She and Willow were later reunited in New York, where she expressed protectiveness of Willow to Buffy having heard of Buffy's lesbian encounter with Satsu. Though she was aware of Willow training under the demon Saga Vasuki, she remained unaware of the sexual aspects of their relationship.
Kennedy traveled to Tokyo to give new squad leader, Satsu, a performance evaluation. Satsu, a lesbian, had recently shared a one-night-stand with Buffy, who was straight. Kennedy wished to support Satsu on her situation and help her to move on from Buffy. 
After the Seed of Wonder was broken and all magic disappeared from Earth, she comforted Willow. After the battle, Willow broke up with her since she felt Kennedy was only with her because of her magic powers. Kennedy expressed anger at Buffy's decision because she believed that Willow was close to defeating the attacking demons without Buffy's intervention. 
- "People hire us because we're strong, smart, and good in a fight. Not because they're scared of refuges from the hell dimension next door. They want us to protect them from kidnappings, ransoms, assassinations even... so if you want me to certify you for field work, you need to stop looking at the world like you're the Chosen one."
- ―Kennedy explaining Deepscan to Buffy[src]
After the break-up with Willow, Kennedy was one of the few Slayers Buffy kept in contact with despite the resentment and blame she still regarded the older Slayer with.
Eventually, Kennedy found even ground and a purpose. She became the founder of Deepscan, a bodyguard profession where she helped other Slayers find a job to do that didn't include slaying. Buffy sought her out and gave it a shot only for Kennedy to scold her for not shutting off her Slayer instincts during a test, concluding that it was because Buffy didn't know how to do anything else but slaying. Nevertheless, she allowed Buffy to have her first client named Theo Daniels who was being hunted by Wolfram and Hart and lend a hand to her in dealing with all of it.
However, Theo was kidnapped by Eldre Koh and Kennedy and Buffy were forced to come up with a plan of attack. She blamed Buffy for being so busy caught up in saving the world that she would risk Theo's life, mentioning that she had done the same with Giles. Furious and stung, Buffy punched Kennedy, insisting that no one was going to die. Together, they snuck underground and saved Theo just in time before Koh could receive his information, consequently destroying TinCan. Instead of criticizing Buffy for her actions, she gave her praise and encouragement. Kennedy gave her a check for her promotion, only to have the older slayer turn it down as she wanted to do things her own way. 
- "Don't be a brat, slinky. That's my profession, and I don't like amateurs crowding me."
- ―Kennedy to Satsu[src]
Outspoken confrontational, confident, and never one to shy away from confrontation, Kennedy made her presence known by both aggressively pursuing her attraction to Willow, and coming to verbal blows with Buffy several times. Continually disagreeing with Buffy's choices, she played an instrumental part in the argument which ended with Buffy's brief ejection from the Summers' residence and the Scooby Gang. She continued to push an argument with Faith, but was ultimately forced to give in when Faith informed her that she was the leader and she would have to get used to it. Later, she freely admitted to being a "brat" on numerous occasions. 
Unlike the other Potential Slayers, Kennedy sometimes became involved with actions and events of core Scoobies. Kennedy served as a martial arts instructor to other Potentials, showing and enjoying a "drill sergeant" attitude, echoing Gunnery Sergeant Hartman of Full Metal Jacket and Sergeant Foley of An Officer and a Gentleman. Like them, she unknowingly helped drive the weakest of the "recruits" to suicide (in this case, Chloe, whom she called "maggot") when the First Evil manipulated the feelings of weakness Kennedy caused. Kennedy chose to dismiss her other responsibilities, opting to feign illness to avoid joining Vi, Rona, and several other potentials on a vision quest to converse with the spirit of the First Slayer, instead choosing to take the opportunity to further pursue her relationship with Willow.
Following the end of magic, Kennedy seemed to have newfound maturity and patience. Finally finding her purpose as a Slayer Bodyguard, she seemed more understanding and less selfish, as she expressed a desire to help her clients and give other fellow Slayers a purpose since the failure of the Slayer Organization. Unlike Buffy, she was able to shut off or ignore her Slayer instincts to get the job done, openly saying with confidence that the world needed to deal without the help of Slayers for once. 
Behind the Scenes
- She was portrayed by Iyari Limon.
- According to the shooting script for Bring on the Night, Kennedy is nineteen, and the oldest of the Potentials to arrive at that time. Although this information is never given on-screen, Kennedy does reference herself as being the oldest of the Potentials.
- After her first appearance, Kennedy was never absent from the series.
- Online critic Amy Amatangelo's readers gave Kennedy the "Can We Vote Them Off the TV Island?" award for the "Most Annoying Character" in the 2002-2003 television season, narrowly beating Connor from the Angel series. Phi-Phenomenon, a site that provides statistical analysis of online Buffyverse opinion, has demonstrated that the number of lines of Kennedy dialogue is a statistical predictor of an episode's unpopularity, both among committed Buffy fans and among those who by this time were disenchanted with the show.
- Show creator Joss Whedon describes the character by saying that, "Kennedy is, as she herself said, a bit of a brat. What I wanted was an anti-Tara. I wanted somebody who was as different from Tara as possible. Tara was very reticent, and she was somebody that Willow caused to blossom. What I wanted was somebody who was further on down in dealing with her sexuality than Willow ever was. Somebody who was totally confident, who was totally not earthy-crunchy, who was a completely different person."
- "Bring on the Night"
- "The Killer in Me"
- "First Date"
- "Get It Done"
- "Lies My Parents Told Me"
- "Dirty Girls"
- "Empty Places"
- "End of Days"
- Buffy the Vampire Slayer: Willow
- Anywhere but Here (Only in flashbacks)
- Time of Your Life
- Last Gleaming