The best replacement for iron fist is black panther.

The best alternatives to iron fist are rated as following:
★★★★★  black panther
★★★★★  shang chi
★★★  luke cage
★★★  ryu
★★  daredevil
★★  lady shiva
★★  karate kid
★  akuma
★  mold breaker
★  gorgon
★  blaze infernape
  sheer force
  velvet glove

Your alternative for iron fist is not listed? Suggest!
Speaking about iron fist, one probably shouldn't forget about velvet glove.

Other search terms related to iron fist and their ratings are:
★★★★★ velvet glove
★ rza
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iron fist
black panther
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