IDIOMS

warm body

(idiomatic) Any person who is present.

Example: 2014 September 12, Jim Alampi, “How a Warm Body Sometimes Can Be Worse Than Nobody at All”, Entrepreneur:
  So when leaders keep around C players (or the warm bodies), the result is almost always worse than having nobody for a short period of time.
2013 May 30, “Five Tips to Hire for Loyalty, Not Just a Warm Body”, HR News Daily:
  Why just hire a warm body, when you can hire for loyalty?.