The best replacement for voldemort is sauron.

The best alternatives to voldemort are rated as following:
★★★★★  sauron
★★★★★  dumbledore
★★★★  harry
★★★  palpatine
★★★  darth vader
★★  vader
★★  grindelwald
★★  gandalf
★  mary poppins
★  saruman
★  harry potter rap
★  harry potter
★  darth sidious
  yoda
  volturi
  harry rap battle
  snape
  lord vader
  tom riddle
  pope
  joker
  sidious
  riak

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

Other search terms related to voldemort and their ratings are:
★★★★★ nagini
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voldemort
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