Washing + Pink Bean

Mages, with about 3579 HP with HB (and the 4th job medal), could skate by PB's big bang attack, if only sometimes (3579*5=17895). They wouldn't be close enough to take touch damage, they would be able to attack Hugin and Munin without making those statues go crazy, and they could survive anything else that needs to be survived. In kMS, these guys would probably do top-tier damage to PB because of his physical resistance.

That's a pretty bad estimation of what mages have. According to this:

HP/level: 10-14

2nd job advancement:
Minimum HP: Level*10+64
Minimum MP: Level*22+488

at level 30, the minimum amount of HP a mage has is 364. Assuming this mage gains an average of 12 HP per level, that means at level 180, a mage has 2164 HP already. Add a MoN and a Master Adventuer Medal and that mage will have 2664 HP. Add HB and that mage has 4262 HP. That's enough to survive 4262 x 5 = 21310 damage. If that's not enough, level the mage to 200 and the mage will have 4646 HP with HB. That's enough to survive 23232 damage, well over the requirement for Pink Bean.