Rebecca

Alpha's assistant, Rebecca is also a Zoid pilot and a spy for his organization. She infiltrates the Mach Storm team posing as a Zoid pilot, and provides information on their activities. She is also very loyal to Alpha, willing to stand between him and the rampaging Gojulas Giga. Rebecca piloted a Dimetroptera. She originally has long purple hair, but wears a short red-and-orange wig and translucent blue shades during her spying on Mach Storm.

Her voice constantly changes throughout her appearances in the American version. Sometimes she has a deep voice, while at other times she would have a sweeter voice.

(Source: Wikipedia)