The best replacement for emperor is king.

The best alternatives to emperor are rated as following:
★★★★★  king
★★  horus
★★  yoda
★  dictator
★  aquaclear
★  elector
★  ambassador
★  pope
★  g2
★  vintage emperor
★  darth vader
★  emperor
★  void dragon
★  khorne
★  pharaoh
★  penguin
★  powerstroke 3
  penguin filter
  shogun
  adelie
  king penguin
  luke
  king penguins
  mace windu
  thorns
  luke skywalker
  penguin filters
  empress
  evans g2
  pinstripe
  mace

Your alternative for emperor is not listed? Suggest!
Speaking about emperor, one probably shouldn't forget about strength i burn.

Other search terms related to emperor and their ratings are:
★★★★★ strength i burn
an empire
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Google Trends

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emperor
king
horus