I went Lightning as the main (Fang when I wanted to manually debuff though) with Fang and Hope.
I spent a couple of hours just before the last bosses beating that undying cieth for 64000 CP for a 1:30 minute fight so I could fully fill up the Cryterium on all 6 roles for all 6 characters. Only problem now is that it's expanded and I have to fill up the last roles which will cost something like another 4.5M CP.
That said, I made sure I finished the game with 999,999CP so I couldn instantly fill up one and a half final levels.
Shame there isn't a power level point like that in post story play.
CPU: Intel Core i5 2500K @ 4700mhz - 47 x 100MHz
Mobo: MSI P67A GD65
GPU: EVGA GTX 570
RAM: 2 x 4GB Mushkin LV 1.35v 1600MHz DDR3
HDD: 3 x 1TB Samsung Spinpoint F3's
Case: CoolerMaster ATCS 840 - Custom House of Kolor paint job.
PSU: Corsair HX750
Cooling: Custom WC - XSPC Delta V3, PA120.3, DDC Ultra with XSPC Res Top, 3/8" XSPC UV Green Tubing over 1/2" Barbs
OS: Windows 7 Enterprise Edition 64-Bit