https://www.pcgamer.com/mortal-kombat-11s-the-kollector-keeps-some-grim-things-in-his-backpack/

The next fighter officially confirmed for Mortal Kombat 11 is The Kollector, one of the characters revealed via a roster leak a few weeks ago. 

"A proud servant of the Outworld Empire", the Kollector "cares only for his wealth and status and will kill anyone to keep it". At first glance he seems to have just the one extra pair of arms, but a minute into the brief teaser video shows another pair of limbs clinging onto his backpack. They only seem to get involved when it comes to the evisceration.