The best replacement for yuffie is tifa.

The best alternatives to yuffie are rated as following:
★★★★★  tifa
★★★  rikku
★★★  cid
★  barrett
★  red xiii
★  vincent
★  yuffie
  kairi

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

Other search terms related to yuffie and their ratings are:
★★★★★ tifa
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Google Trends

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yuffie
tifa
rikku