There were many different designs for the ice theme, why the others weren't used?

Yes, we had several drafts for it, and we hesitated for a while. But we decided to give them up because their colors were so similar that the two forms of Palatinus Equinox didn't have enough contrast.

Different from the character's original design, her hair would now become braided after switching to Knight Form. Will you please elaborate on your idea for this creative design?

If her hair was put down in the Knight Form, it would cover a large part of the outfit and might cause model overlapping. Therefore, we changed her hair style to braids. (This also means we can have braids for Durandal, haha)