The best replacement for batgirl is catwoman.

The best alternatives to batgirl are rated as following:
★★★★★  catwoman
★★★★★  supergirl
★★★★  batwoman
★★★  poison ivy
★★  harley quinn
★★  black widow
★★  nightwing
★★  robin
★  starfire
★  wonder woman
★  huntress
★  lady shiva
★  batgirl
★  black canary
★  elektra
  clayface
  electra
  shiva
  spider girl
  spidergirl

Your alternative for batgirl is not listed? Suggest!
Speaking about batgirl, one probably shouldn't forget about supergirl.

Other search terms related to batgirl and their ratings are:
★★★★★ supergirl
★ catwoman
You have in mind a companion for batgirl and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of batgirl in all years. Click on graph for more.
batgirl
catwoman
supergirl