The best replacement for guts is balls.

The best alternatives to guts are rated as following:
★★★★★  balls
★★★  kenshin
★★★  femto
★★  zodd
★★  griffith
★★  iron fist conkeldurr
★★  swarm
★★  zoro
★★  no guard
★★  clare
★★  artorias
★★  grunbeld
★  sheer force
★  moxie heracross
★  sheer force conkeldurr
★  nuts
★  gut
★  slan
★  moxie
★  thick fat
  kirito
  no guts
  kenshiro
  sheer force timburr
  swarm heracross
  global guts

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

Other search terms related to guts and their ratings are:
★★★★★ glory
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Google Trends

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guts
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