I've been watching the entire Buffy the Vampire Slayer series on Netflix lately, so in that spirit, here is a post-movie, pre-Sunnydale Buffy:
Name: Buffy Summers
Template: Emissary of Power (pg. 75)
Musts: Marked by Power (minimum refresh -1)
High Concept: The Slayer
Trouble: I’m Just a Kid
Phase One: I Didn’t Ask for This Destiny – Buffy was the stereotypical cheerleader at Hemery High School in Los Angeles. She is a carefree popular girl whose main concerns are shopping and spending time with her friends. While at school one day, she is approached by a man named Merrick Jamison-Smythe. He informs her that she is The Slayer, or chosen one, and he is a Watcher whose duty it is to guide and train her. She initially refuses to believe his claims, but becomes convinced when he is able to describe a recurring dream of hers in great detail (tied to Cassandra’s Tears).
Phase Two: With Great Power Comes Great Responsibility - Over the course of her training she becomes friends with Oliver Pike, whose best friend has recently become a vampire. Oliver becomes the male equivalent of the traditional "damsel in distress", being rescued by Buffy or Merrick on several occasions. However, their relationship gradually becomes romantic and Oliver becomes her partner in fighting the undead.
Phase Three: The Right Stuff - After several successful outings, Buffy is drawn into conflict with a local vampire king named Lothos, who has killed a number of past Slayers. Lothos eventually kills Merrick as well, giving her the motivation she needs to face him in battle. They eventually clash during the middle of the senior dance at Buffy's high school. Through the use of her own unconventional methods, she is able to defeat Lothos and his minions.
Phase four and five left incomplete to reflect this being a pre-Sunnydale Buffy, though once she moves to Sunnydale the possible additional aspects could be I Get By With a Little Help From My Friends, and Star-crossed Lovers as she gets to know the “Scooby Gang” and falls for Angel. Possibly also Problem Child as her duties and habits tend to get her in trouble with the authorities, her friends, and her mother. Another option is I Live on the Hellmouth, since, well, she does.
Power Level: Submerged
Skills: Cap = Superb : Points 35/35
+5 Fists, Weapons
+4 Athletics, Endurance
+3 Alertness, Might
+2 Intimidation, Conviction
+1 Scholarship, Lore, Investigation, Empathy, Rapport, Deceit, Presence
Powers and Stunts:
-1 Redirected Force (pg. 152)
-1 Step Into the Blow (pg. 152)
-1 Marked by Power (pg. 169)
-0 Cassandra’s Tears (pg. 172)
-4 Supernatural Strength (pg. 183)
-2 Inhuman Recovery (pg. 185)
-2 Inhuman Toughness (pg. 185)
+2 The Catch - Mind affecting attacks lower her defenses (pg. 185)
Base Refresh 10 - Refresh Adjustment 9 = Adjusted Refresh 1
Stress:
Physical OOOO(OO) : Mental OOO : Social OOO : Armor +1