The best replacement for kirito is silver crow.

The best alternatives to kirito are rated as following:
★★★★★  silver crow
★★★★★  gleam eyes
★★★  eren
★★★  asuna
★★  haruyuki
★★  sugou
★  kayaba
★  heathcliff
★  kite
★  shiroe
  guts

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

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



Google Trends

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kirito
silver crow
gleam eyes