In the animated series, Mara was Master Sebrian's assistant and a love interest for Prince Adam. Towards the end of the series, Mara was crowned Queen of the Mytes, at which point she was given a new costume. This unproduced prototype is based on Mara as seen in the final episodes of the series.
Mara's action feature seems to be her "hair mace" which would whip around after you wound her waist up - similar to Spinwit's action feature.
Mara is known to exist only in the painted and unpainted prototype below, which is in a private collection.