a close friend.
a confederate or assistant.

1900–05, Americanism; side1 + kick Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sidekick (ˈsaɪdˌkɪk)
informal a close friend or follower who accompanies another on adventures, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"companion or close associate," 1906, shortened from side-kicker (1903, in an O.Henry story), Amer.Eng., of unknown origin. Earlier terms were side-pal (1886), side-partner (1890).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Ant is his sidekick that feels he needs to stick up for everyone and feel the
  rage of his power.
At some point during this exchange, the booth operator's sidekick sneaks up and
  steals your wallet.
As an antibiotic sidekick, it's definitely still on the mysterious side.
Some actors seem destined to play the quirky sidekick.
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