Mild sarcasm was intended since Parum's AC is 13 and HP 10. Neither would I volunteer the old crazy pirate. 

My vote would be either Brannor or Orchid.

Here is my pitiful attempt of a breakdown for each nomination, assuming we have finished a long-rest.

Ashkar Brannor:
Initiative = +1
Strength   = 18 
Athletics  = +6
HP = 12
AC (Chainmail) = 16 + Shield (2) = 18
Greatsword = +6 to hit; 2d6+4 damage, without shield

Orchid Wildflower:
Initiative = +2
Strength   = 17
Athletics  = +5
HP = 14
AC (Unarmored Defense) = 14 (DEX 2 + CON 2) + Shield (2) = 16
Dual wielding Handaxe x 2 (Light) = +5 for first hit for 1d6+3; +3 for second hit for 1d6: 2d6+3 if both hits, without shield
Rage: 
	+2 damage rolls which increases this to 1d6+5 and 1d6+2 = 2d6+7, if both hits
      	Advantage to Strength checks (Athletics)
      	Resistance to bludgeoning, piercing, and slashing damage.

If the half-dragon misses twice, our paladin will come ahead. If he never misses, our barbarian comes ahead. 

If we haven't long-rested, I would nominate Brannor. 

If we have long-rested, Orchid is slightly ahead if he dual wields 2 handaxes, has rage to halven damage from non-magical weapons, has advantage with +5 to grappling, and regains the benefit of Restless endurance.       

These are my two cents, with my deposit depending if we have a long rest.

Now I believe we should all go down together in support of our 'champion,' in case something goes awry. No reason for us to stay in the keep, even if we haven't rested.