Tiz - defensive + using kairai on himself with 500ish p.defense (except in fights where there are no single target moves to speak of)
Agnes - healer + enigma/fairyward/etc. + steady MP recovery + holyone/healinglore 9999 groupcast Curada every turn forever and ever
Ringabel - physical damage dealer, somewhat torn between amped lunch or rage, and also whether to use the no-gear monk-passive setup (main problem here counterbalancing the super power is the standard move's 9999 cap, and the inevitable sub-100 speed due to no gear slots)
Edea - kinda wanted her to be a swordmaster for flavor, but the job's direct offensive oomph is so 'meh' so she usually ends up being magic dps (for party balance's sake) or speedy physical dps or support (eg. my hero / mimic spam, or when I need enigma and heals at the same time, etc.)
Battles end up taking longer than they really should at times, but I always try for a "golden trinity" kind of class arrangement and no duplicate jobs if at all possible.
The whole vestal (miko in the JP voicing) shtick made her seem a natural fit as a cleric to most, I guess.
Plus, after facing the Barras/Holly combo, I'd imagine it'd be a natural fit to make Tiz the monk and Agnes the White Mage when trying out your shiny new Jobs (especially with how daft the male White Mage outfit is).