The best replacement for sylar is peter.

The best alternatives to sylar are rated as following:
★★★★★  peter
★★★  samuel
★★★  hiro
★★  peter petrelli
★  spock
★  burning
  arthur petrelli
  petrelli
  peter heroes

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

Other search terms related to sylar and their ratings are:
★★★★★ claire
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Google Trends

Scale is based on the average worldwide traffic of sylar in all years. Click on graph for more.
sylar
peter
samuel