Before even Buffy was created, there was Xena: Warrior Princess. In many ways this show was a precursor to Buffy, with many similar themes (although they were running at the same time for quite a while). This show features Xena, a warrior woman just as strong as Buffy. She was once a ruthless killer, but changed her ways and now spends her life trying to help others to redeem herself, on a quest for the "greater good."
Although there are not the same monsters, demons or vampires in Xena, she does have to fight other strange creatures (mostly from Greek mythology) such as centaurs and even gods (similar to Buffy's fighting Glory) to protect the world. Xena does not have a "Scooby gang" like Buffy does, but she does have her two best friends to help her: Gabrielle, a bard, and Joxer, the ridiculous comic relief character.
Xena even had a lesbian subtext before Buffy did. Although much more ambiguous than Willow and Tara, Xena and Gabrielle seem to have more-than-friendly affections for each other. They even kissed a few times. The creators of the show purposefully made it unclear whether or not they were really in a relationship, but there was definitely something there.
We think of Buffy as THE groundbreaking feminist show of the '90s, but clearly it was not the only one. Xena was a great feminist role model as well - possibly even a role model to Buffy herself.