I have successfully completed Lunatic+. the save is gone (lost the cartridge && had to buy a new one D,: ) but it was mostly a combination of luck and optimal play. Tight formations, galeforce, and a deep understanding of the RNJesus and the enemy AI are absolutely imperative, as well as the Infinite Regalia DLC pack, R&R 3, Lost bloodlines 2 & 3, Champs of yore 3, and Smash Brethren 2 dlc. this will give you some of the most important things for completion;
Money (golden Gaffe)
easy EXP (EXPonential Growth, Lost bloodlines 3)
Paragon skill (Lost bloodlines 3)
Dread fighter class for res +10 and aggressor (Lost bloodlines 2)
Limit breaker (R&R 3)[this one is ABSOLUTELY IMPERATIVE]
all stats +2 (Champs of yore 3) [this one to a slightly lesser extent]
the Bride class (Smash Brethren 2)
And the silver card (forget which one gave you this)
It also helps to start out with 99999 renown, because those items will help a ton, and the Supreme emblem is A HUGE boost to money. The biggest problems you will face however, are the fist few missions where you don't have access to DLC and/or items, so you are basically limited to trying over and over again until something works. Aside from that... grind the $(-)!t out of everything and it'll work eventually!
