The best replacement for katara is zuko.

The best alternatives to katara are rated as following:
★★★★★  zuko
★★★★★  toph
★★★★★  azula
★★★★  master pakku
★★★★  hama
★★  korra
★★  aang
★★  yon rha
★★  elsa
★  amon
★  mai
★  ty lee
★  pakku
  unalaq
  sokka

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

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



Google Trends

Scale is based on the average worldwide traffic of katara in all years. Click on graph for more.
katara
zuko
toph