Buffy (Buffy the Vampire Slayer)
Willow, Tara and Anya are all powerful ladies, but Buffy goes through so much throughout the series – Hellmouth demon-fighting stuff AND normal teenage angst stuff – that she’s one of the strongest women ever to appear on TV. She kicks vampire ass, regularly saves her friends/little sister/boyfriends, deals with the death of her beloved mom AND looks phenomenal in late 90s/early 2000s outfits through all of it.