The best replacement for nami is kalifa.

The best alternatives to nami are rated as following:
★★★★★  kalifa
★★★★  lulu
★★★★  thresh
★★★★  leona
★★★★  sona
★★★  robin
★★★  sakura
★★  janna
★★  lucy
★★  soraka
★★  zyra
★  califa
★  miss doublefinger
★  nico robin
★  blitz
★  usopp
★  boa hancock
★  absalom
★  taric
★  blitzcrank
★  hancock
★  kumadori
  sanji
  arlong
  vivi
  monkey d luffy

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

Other search terms related to nami and their ratings are:
★★★★★ sanji
★★★ luffy
★ one piece
You have in mind a companion for nami and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of nami in all years. Click on graph for more.
nami
kalifa
lulu