The best replacement for demons is angels.

The best alternatives to demons are rated as following:
★★★★★  angels
★★★★  ghosts
★★★  devils
★★★  aliens
★★  fallen angels
★★  fairyland
★★  mental illness
★  daemons
★  da vinci code
★  vampires
★  spirits
★  schizophrenia
★  evil spirits
★  sleep paralysis
  davinci code
  dragons
  angels game
  angels pictures
  angels tattoos
  angel
  ghost
  unclean spirits
  zombies
  devil
  angels movies
  reptilians
  psychosis
  illness
  gods
  fairies

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

Other search terms related to demons and their ratings are:
★★★★★ ryu
★★★ ryu emmure
You have in mind a companion for demons and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of demons in all years. Click on graph for more.
demons
angels
ghosts