The best replacement for killua is gon.

The best alternatives to killua are rated as following:
★★★★★  gon
★★  youpi
★★  hisoka
★★  hiei
★★  shoot
★★  rammot
★★  illumi
★  kurapika
★  pouf
★  phinks
★  palm
  feitan
  kurapica

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