Panels!

I loved magic. I filled the panels with mostly fire and aero, stayed a good distance away from the enemy, and spammed .
It took a long time defeating the bosses that way, but hey, it's fun and it adds a little more difficulty to the game, seeing as you're replacing level panels with magic panels. Obviously, I used the gears which increased magic, so I was quite frail. But it made the game more thrilling.

On a side note, against the final boss of the game, (not giving any spoilers) you can simply spam aeroga every time he tries to attack, and he flinches for a brief second.

 

I didn't explore too much when it came to the panels in KH 365/2 Days. Whenever I decide to replay the game, I'm going to try to make more use out of it. (It's actually been a few years since I last played it, however, I still remember the storyline vividly.)

I loaded up my old file to see what panels I did use.
I mostly only used the Lv. panels (I have an entire page full !), but I also had "Air Slide", "Glide", "Backpack", some magics and a lot of potions.

I do remember that my favourite panels were the lvl up ones and my favourite spell was blizzard

 

I'm not sure if this is on topic or not, but I'm attempting a level 1 challenge of this game on proud mode. Magic REALLY helps.

 

I used mainly level ups and cura, however fire spells can prove very useful on the ambush missions.