The best replacement for nico is niko.

The best alternatives to nico are rated as following:
★★★★★  niko
★★★★  percy
★★★  albatross
★★  4u2c

Your alternative for nico is not listed? Suggest!
Speaking about nico, one probably shouldn't forget about velvet underground.

Other search terms related to nico and their ratings are:
★★★★★ velvet underground
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Google Trends

Scale is based on the average worldwide traffic of nico in all years. Click on graph for more.
nico
niko
percy