The best replacement for roach is waterbug.

The best alternatives to roach are rated as following:
★★★★★  waterbug
★★★★★  beetle
★★★★  bed bug
★★★  cockroach
★★★  water bug
★★★  cricket
★★  hydralisk
★★  mouse droppings
★★  stalker
★★  palmetto bug
★★  hydra
★★  mice droppings
★★  filter
★  iorveth
★  zealot
★  no roach
★  holbrook
★  rudd
★  filter joint
★  garunix
★  camacho
★  grapha
★  gorz
★  mouse feces
  another bug
  immortal
  linden
  earwig
  weatherman
  ariza
  zergling
  german roach
  rich
  bedbug
  roach
  marauder
  krugman
  greer

Your alternative for roach is not listed? Suggest!
Speaking about roach, one probably shouldn't forget about manny pacquiao.

Other search terms related to roach and their ratings are:
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roach
waterbug
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