The best replacement for gangplank is pantheon.

The best alternatives to gangplank are rated as following:
★★★★★  pantheon
★★★★  olaf
★★★  miss fortune
★★★  tryndamere
★★★  shen
★★★  nidalee
★★  gragas
★★  wukong
★★  teemo
★★  xin zhao
★  mordekaiser
★  shaco
  urgot
  blitzcrank

Your alternative for gangplank is not listed? Suggest!
Speaking about gangplank, one probably shouldn't forget about trinity force.

Other search terms related to gangplank and their ratings are:
★★★★★ trinity force
You have in mind a companion for gangplank and it is not yet here? Propose!



Google Trends

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gangplank
pantheon
olaf