Nah Jusis, Crow and Millium kinda get a fair amount of growth. You mentioned Fie. She definitely has the best starting point of all of them. I think they dropped the ball hard with Machias, Emma and Alisa. Also that Laura, Elliot and Gaius likely did not have to be playable.
Elliot feels like he is there to be 2nd healer so they can split the parties which isn't actually needed. Laura feels like she there to be another noble besides Jusis so Class 7 initially (before Rean outs himself.) doesn't seem like it's all commoners and 1 noble and to fill the slow power character role. They really didn't try with her character. It really is all Way of the Sword and being socially awkward because she spent all her childhood doing the blademaster thing. Gaius feels like they did the bare minimum and then tried to fix it later.