The best replacement for itachi is sasuke.

The best alternatives to itachi are rated as following:
★★★★★  sasuke
★★★★  kakashi
★★★  madara
★★★  orochimaru
★★★  pain
★★  naruto
★★  jiraiya
★★  kisame
★  minato
★  obito
★  pein
★  nagato
★  kabuto
★  deidara
★  sasuke episode
  madara stronger
  gaara
  sasuke stronger
  sasuke shippuden
  shisui
  yondaime
  tsunade
  tobi
  sesshomaru
  sasuke manga
  kimimaro
  neji
  hidan
  sasori
  kurenai

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

Other search terms related to itachi and their ratings are:
★★★★★ sasuke
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Google Trends

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