Who are you trapped with, and what do you do to survive? It has to be characters from outside the JP series.
My choices would probably be...
-Kirk from Star Trek
-Luke Skywalker from the Star Wars original trilogy
-Sakura Haruno from Naruto Shippuden
-Captain Price from the MW series
I picked Kirk because he'd be very resilient and would always put everyone else first imo; Luke Skywalker because he could use Jedi Mind Trick on the dinosaurs to get them away from us; Sakura Haruno because she would be a good medic for our group; and Captain Price, because if you'd played the Modern Warfare trilogy, you'd know why I picked him.
