The best replacement for sephiroth is cloud.

The best alternatives to sephiroth are rated as following:
★★★★★  cloud
★★★  genesis
★★★  kefka
★★  dante
★  sesshomaru
★  darth vader
★  lightning
★  vergil
★  xemnas
★  sesshoumaru
  caius
  cloud advent children
  aizen
  sin
  kratos
  kuja
  link
  cloud kingdom hearts
  weiss
  squall
  sora
  genesis and angeal
  ganondorf
  chaos
  zack
  vincent
  seymour
  virgil
  auron
  ansem
  cloud video

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Speaking about sephiroth, one probably shouldn't forget about vincent.

Other search terms related to sephiroth and their ratings are:
★★★★★ vincent
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Google Trends

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sephiroth
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