A gunner with cat nip and 2 gals as mascots to heal and soft should work OK for you.

Although, I've been able to get Chac stuck in a loop. Sometimes Chac will just attack you. If all 3 of your girls are in haste status, you can continually attack without Chac touching you. Eventually your haste will run off and your chain might get broken. However, you can usually beat up on Chac for quite a while if you get lucky. When attacking you have to time it so as one girl is just finishing her attack, the next girl starts (AKA-dont' hold down the button).

Note though that you have to just attack Chac. No trigger happys or magic please! Only regular attacks are fast enough. You might even have the most luck with something other than mascots. They have a long attack animation. Dark Knights might work OK. I guess this works because Chac's attack animation is so long it takes awhile to for it to get started again.

Did that make sense?

PS - Is your avatar Polgara?