Buffy Anne Summers was born on 19 january, 1981 and spent her childhood in Los Angeles. She is the daughter of Hank and Joyce Summers and was good friends of her cousin Celia who mysteriously dies during a hospitalization. She took skating lessons in order to become just as good as her idol Dorothy Hamill. She went to Hemery High in LA where she was one of the popular girls as teenager. She's pretty, smart, funny and is a popular student who is interested in fashion and boys. She became cheerleader and was voted prom queen and Fiesta Queen.

Buffy was approached by a strange man after school in 1996 who tells her about her destiny as vampire slayer. He informs her that she is not just an ordinary girl but a vampire slayer, which is imbued with superhuman strength. She believes that there is nothing, but the man takes her to the cemetery in the evening. She is chosen to combat the demons of the underworld. It's up to her to fight against all baddies that result in its location. He shows her a vampire and she manages to kill that creature.

She tries several times to tell her parents about her new vocation but gets quarrel with her parents. She understands that her parents will not believe her nocturnal activities and disappears for several weeks in a psychiatric institution. Buffy is extremely lonely because her parents stay arguing with each other. She gets troubles on school when she puts the gymnasium of her school on fire. It goes so badly between her parents around that time that they decide to live separate.

Buffy and her mother Joyce move to small California town Sunnydale in 1997. Her father stays behind in LA while she and her mother start a new life. She starts to study at her new highschool Sunnydale High where she met school librarian Rupert Giles. He tells her the same, that she is the chosen one as vampire slayer. Rupert's job as librarian is a cover whose task it is to train her as vampire Slayer. She becomes good friends with the nerdy Willow Rosenberg, the hapless Xander Harris, the popular cheerleader Cordelia Chase, the seemingly "good" vampire named Angel and they are along with Rupert collectively known as the affectionately "Scooby Gang". They notice that there is a "Hellmouth" gateway between the real world and the demon dimension is hidden under Sunnydale, which has a huge attraction over evil. The library is located right above the Hellmouth and is therefore often the target of attacks and rituals. Buffy and her friends battle against all manner of demons and vampires who  terrorize specifically Sunnydale.

Power and Abilities

• She has superhuman strength, speed, agility, reflexes, durability, accelerated healing and a limited ability to sense supernatural activity.
• She has never developed the sense of supernatural power activity.
• She has the collective memories of all past slayers and precognitive dreams which has allowed her to foresee events.
• She possesses also a natural proficiency with virtually all forms of weaponry and unarmed combat styles.
• She is trained in martial arts (karate, kung fu, taekwondo etc.) and in the use of martial arts weapons.
• She is quite intelligent, possessing strong leadership skills and has a natural flair for tactical planning.
• She gains new special powers at the end of the Twilight crisis when her strength, speed, agility, stamina and reflexes were enhanced to vastly superior levels.
• Her new powers are flight, superhuman hearing, telescopic vision and a level of near-invulnerability. 

Other powers 

• Mystical protection: She has some degree of mystical protection over her and even daggers can not pierce her skin.

Temporary Powers

• Telepathy: She has the ability to hear the thoughts of others (vampires doesn't have reflection in the mind) and is unable to control all of the thoughts in her head. 
• Super-Slayer: Her original slayer powers are increased to far greater levels and gained incredibly potent magical abilities. She has a complex spell which calls the pure source of the Slayer's power.
• Invisibility: She was accidentally rendered invisible by the Trio, shortly after her resurrection. 
• Twilight's empowerment: She gains a multitude of new powers as strength, speed, agility, and reflexes were greatly enhanced. She develops telescopic vision, superhuman hearing, flight and a level of invulnerability near the end of the Twilight crisis.