The best replacement for klingons is romulans.

The best alternatives to klingons are rated as following:
★★★★★  romulans
★★  mandalorians
★★  furries
★★  vulcans
★★  krogans
★★  wookies
★★  federation
★  cardassians
★  stormtroopers
★  sontarans
★  new klingons
★  ds9
★  starfleet
  vulcans stronger

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klingons
romulans
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