The best replacement for mr freeze is iceman.

The best alternatives to mr freeze are rated as following:
★★★★★  iceman
★★★★  captain cold
★★★  firefly
★★  pyro
★★  elsa
★★  sub zero
★  scarecrow
  blight
  batman arkham city
  subzero

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Speaking about mr freeze, one probably shouldn't forget about batman.

Other search terms related to mr freeze and their ratings are:
★★★★★ batman
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mr freeze
iceman
captain cold