The best replacement for percy is jason.

The best alternatives to percy are rated as following:
★★★★★  jason
★★★★  luke
★★★  annabeth
★★★  kronos
★★  harry
★★  nico
★  carter
★  thalia
  luke sea of monsters
  percy
  jason better

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

Other search terms related to percy and their ratings are:
★★★★★ annabeth
thomas the train
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Google Trends

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percy
jason
luke