Some people thought Elsa would be the best candidate, hands down, due to her supernatural powers.

Hard To Choose

"I have 3 potential winners:"

"Elsa on account of having super powers that can be used offensively."

"Mulan on having actual combat training."

"Nala (if you count her) for being a literal lion."

– Theher0not

Icy Powers

"Elsa can literally create sentient life and freeze everyone on their starting pedestals aoe style....there's no contest here twentieth level elemental wizard wins."

– Unnecessaryloongname

Fearless

"Ohhh I hadn’t thought of Nala. Technically not in the Disney Princess lineup, and also she’s not a princess. But yes, Nala would be a good contender."

– Pyrocephalus-rubinus

Disqualification

"Not one of the early ones, I’ll tell you that right now."

– ShinyRedBalloon

"Ah, but what if the sounds of the battlefield awaken sleeping Aurora to her true love, the love of Blood drawn in war. She wakes, shatters her glass coffin, and uses the shards of glass as a pair of swords. She hasn't eaten in years, so she doesn't need a lot of food. She jumps full into the fray, slashing and jabbing with her glass swords. Tributes fall to the left and right, as Aurora, goddess of the dawn, destroys them unto their very bloodline. Exterminated."

– jewel-frog-fur

Some thought unique skills and credentials were more effective than witchcraft.

Take A Bow

"Merida is excellent with a bow. I think she’d have a fighting chance."

– UnStoppableWho_

Thematically And Practically

"Thematically? Meridia."

"Practically? Elsa. She's literally a magical ice goddess that can flash freeze an entire lake. The only other princess with anything approaching supernatural power is Moana, and her power is over water ."

– Allfunandgaymes

The Forest Expert

"Thematically, consider Pochahantas and Mulan too! If Elsa didn’t immediately freeze everything in the arena, Pochahantas might survive just from knowing what’s edible and what’s not and being able to track people and avoid being seen!"

– ruiqi22

So which is it?

Woman Warrior

"Mulan - trained warrior with excellent survival skills."

– TitleProfessional760

Weapon Of Choice

"She defeated the boss Hun with a paper fan. I think she's a safe bet."

– inadequatepockets

Hitting The Bullseye

"Don't discount Merida. The Hunger Games were won by an archer, after all."

"Mulan definitely wound up being the skilled soldier of the bunch and probably best survival skills, but Merida was no stranger to the outdoors herself."

– 1CEninja

It's A Toss-Up

"I’m also between Merida and Mulan. I think they both have the skill set to win, but when it comes to killing the other princesses, I think Mulan’s death count will give her an edge. Merida hasn’t killed a human before, while Mulan is a war tested soldier with a 10,000 kill count."

– Pyrocephalus-rubinus

I'd put my pound sterling on Merida to epically conquer all.

Our red-headed heroine is skilled with a bow and arrow and she would fiercely take down leaders of the wealthy Capitol city of Panem to end the annual carnage once and for all.