The best replacement for starfire is raven.

The best alternatives to starfire are rated as following:
★★★★★  raven
★★★★★  blackfire
★★★★  kitten
★★★  firestar
★★★  supergirl
★★★  wrath
★★  batgirl
★★  starfall
★★  robin
★★  evil starfire
★  terra
★  donna troy
★  superboy
★  barbara
★  starfire
★  barbara gordon
  jinx
  ms marvel

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

Other search terms related to starfire and their ratings are:
★★★★★ robin
★★★ thunderbull
nightwing
You have in mind a companion for starfire and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of starfire in all years. Click on graph for more.
starfire
raven
blackfire