It seems that Aisha went through a few different forms before a final design was put together. It seems that since the manga had not reached a point where Aisha is seen without her cloak, the anime had to work out a final design. Early Aisha designs had a sort of magical girl feel, and Aisha carried a staff-like weapon.
Shoulder armor and hair rings were consistent themes in the designs. The staff was likely cut because of Aisha’s inclination towards pure physical strength.