Juna: Sledgehammer is dumb as fuck. I think she's an okay character, but after playing the Crossbell games, her inclusion and supposed background with the S.S.S. seems a bit weird. The best way I can describe it is in Chapter 2. I won't go into spoilers, but something happens, a character from the Crossbell games is there, and it feels like that character should have been the focus instead of Juna.
Kurt: ToCSIII has some translation errors, and that includes his Brave Order; it implies it cuts delay numbers by 30%, when it's actually 70%. So an action giving 10 delay would instead give 3. This is ridicious. Kurt's better than Juna, imo.
Altina: Best school outfit/10. I'm not too keen on her character, but it's an improvement compared to ToCSII.
Musse: Rean is going to get fired. Strangely enjoyable character, easily my favourite of the new characters.
Ash: Jedi said Ash would be my favourite character from this game. At first, I couldn't see it, but by the end he's definitely my second favourite.
Also, Rean is at his best in this game. Keep the glasses on him.
EDIT: Gonna shill the SF Falcom Discord server, may as well. If you want to enter, hit me up.