The best replacement for nakama is genki.

The best alternatives to nakama are rated as following:
★★★★★  genki
★★★★  tomodachi

Your alternative for nakama is not listed? Suggest!
Speaking about nakama, one probably shouldn't forget about jun matsumoto.

Other search terms related to nakama and their ratings are:
★★★★★ jun matsumoto
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nakama
genki
tomodachi