I'm glad it has a demo because I know a lot of people don't enjoy characters like that; there's some great heartfelt conversations once you get to know the characters, but you have to be able to stand 20+ narmy and overly polite banter sequences to get to the moments where each of them surprises you. If you get that far, you usually get invested.
I REALLY like what they've done with the combat in this one. Even on normal, I was losing early boss fights for playing without consideration and using nothing but the enemy's elemental weakness. I just finished Chapter 1, and I especially liked having moments where half the party was dead, and attacking was actually a good option to give my team a moment to revive each other, thanks to the stun/delay systems.