The best replacement for inuyasha is sesshomaru.

The best alternatives to inuyasha are rated as following:
★★★★★  sesshomaru
★★★  bleach
★★★  naraku
★★  ichigo
★★  koga
★  sesshoumaru
★  bankotsu
★  kagome
★  yusuke
★  goshinki
  ryukotsusei
  rurouni kenshin
  edward elric
  yu yu hakusho
  kouga
  ranma
  kenshin
  full metal alchemist

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

Other search terms related to inuyasha and their ratings are:
★★★★★ kagome
★ kikyo
★ you aaa
sango
sesshomaru
sesshoumaru
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