1. No Vampire/Demon/Monster is a Match for Her
2. She's the Queen of Puns and Witty One-Liners
Not only can she defeat every creature that comes her way, but she does so while making hilarious one-liners and clever puns. Because no one realizes the ridiculousness and absurdity of her life as the Slayer more than Buffy Summers.
3. She's Willing to Make Huge Sacrifices for the Greater Good
Whether it be killing the man she loves to stop the world from ending or sacrificing her own life to, well, stop the world from ending, she's no stranger to having to make big sacrifices for humanity's sake. And while each decision leads to heartbreak and a lot of tears, she faces them with extreme strength and never regrets making them.
4. Her Friends and Family are Her Number One Priorities
When it comes to life, there's nothing more important to Buffy than those she loves. She would do absolutely anything for her friends and family and constantly puts herself in harm's way to keep them safe.
5. Not Even Death Can Stop Her
Buffy's no stranger to death (having died twice by the show's end), but something as mundane as her heart not beating isn't enough to keep this Slayer from kicking ass. Both times she finds a way to get out of her predicament and get back into the real world to keep showing bad guys what's up.
6. She's Had Some Rough Experiences but Always Bounces Back
Throughout the course of the series, Buffy deals with a lot of trauma and has to overcome the deaths of loved ones, extreme heartbreak, and life on the hellish Earth after existing in a perfect afterlife. But despite how tough her life gets and how much pain she's put through, she always manages to find the emotional strength to pull through and keep living in the face of pain and depression.