My final party consisted of...
Claude - Level 101
Precis - Level 86
Celine - Level 81
Rena - Level 87
Welch - Level 76
Leon - Level 83
Noel - Level 84
Empty 8th char slot. D=
673 Battles fought.
Totally missed out on so many opportunities for recruiting some characters that I had originally planned to, like Ashton or Opera (+ Ernest instead of Noel), and Chisato. Heck, I even made sure to see Opera in the Private Action at Cross as well, in case I miss Ashton, which I totally did. Next play I do, I'll be looking at a guide for recruitment purposes to make sure that I get the party that I want. In fact, I'll go ahead and list them, I guess.
My next game will be as Rena, and the final party will hopefully be Rena, Claude, Celine, Dias, Opera, Ernest, Bowman, Chisato.
Below is the ending that I got out of the supposedly possible 119 endings.
Now I don't know whether if I want to bother with the Cave of Trials in this save, since I absolutely neglected a lot of Item Creations and Talents, like Pickpocketing, Customization, and other good end-game stuff. On top of that, being that my final party was not what I had expected it to be, I'm considering attempting it on my second run while using a guide for the important stuff with Pickpocketing and such.
As for the difficulty, I would have liked to go for Universe difficulty, but I need to fight 2000 battles to unlock it. Here I am, willing to start a new game at 673 battles.. ._.' So my second run will also be on Galaxy difficulty. Edit: Or not. The game let me select Universe difficulty for some reason; possibly because I got an ending.
Not sure what other details I should put here, so I'll just leave it at that for now. Leave a comment on what details you want here, and I'll edit this post to include what's requested.