I can see Rihanna having a bow an arrow and just hiding out and shooting people as they ran by. She'd ally with Xtina and Katy (who'd die early on) and then replace Katy with Rita Ora who she'd shove in front of her whenever danger came.She'd probably see a cocobut or mango tree and try to take one and get killed by trackerjackers or whatever tho...
Christina Aguilera tbh. She'll start singing as loud as she can in the top of the mountain causing to disrupt the ecosystem of the forest arena putting the animals in the state of berserk due to the exposure of extreme amount of decibels to the animals and they pillaged everything and everyone in the arena.