I'm playing on normal, so I'm sure part of the problem is that this is a fairly easy game (especially with the SOS button and Rise's boosts), but Naoto seems basically game-breaking. With Hama Boost and Mudo Boost, I'm frequently one-shotting every enemy on screen, and Invigorate 3 basically negates the SP cost. She has no elemental weakness, and starts with Megidolaon (which I understand is much more affordable in Golden).
My impression was that her one downside was lack of high-damage attacks for boss fights, but between the +25% ice gun and a +40% ice accessory, she's doing more than enough damage. I guess her HP and En are pretty weak, but speaking of game-breaking stuff, I've got two party members with Mediarahan :).
Again, I know this game generally isn't that hard, but I'm getting a bit sick of fights because they're just so easy. Even Hollow Forest is a chore, since she's basically self-sustaining in terms of SP. Do more enemies in the true ending dungeon have dark/light resistances, or is the rest of the game (last boss maybe notwithstanding) going to be a breeze?