The best replacement for korra is aang.

The best alternatives to korra are rated as following:
★★★★★  aang
★★★★  amon
★★★  azula
★★★  unalaq
★★★  katara
★★★  vaatu
★★  last airbender
★  desna and eska
★  chi blockers
★  avatar
★  tahno
★  avatar the last airbender
  ang
  asami
  tarrlok

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

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



Google Trends

Scale is based on the average worldwide traffic of korra in all years. Click on graph for more.
korra
aang
amon