The best replacement for fizz is ahri.

The best alternatives to fizz are rated as following:
★★★★★  ahri
★★★★★  zed
★★★★  akali
★★★★  leblanc
★★★★  yasuo
★★★★  ziggs
★★★  talon
★★★  diana
★★★  kassadin
★★★  gragas
★★  katarina
★★  ryze
★  riven
★  kha'zix
★  khazix
★  annie
★  kayle
★  heimerdinger
★  swain
★  fiora
★  lux
★  irelia
★  syndra
  nidalee
  draven
  darius
  orianna
  rengar
  malzahar
  veigar
  vladimir
  mordekaiser
  slam bam
  lee sin
  lissandra
  brand
  teemo
  mimosa
  cassiopeia
  natural calm

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

Other search terms related to fizz and their ratings are:
★★★★★ ryze
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Google Trends

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fizz
ahri
zed