(I don't own this picture. All Rights go to the owners.)

Name: Aria Shimamoto
Age: Same age as Masa
Gender: Female
Species: Human
Appearance: Season 1: Long blue hair in low pigtails, emerald green color eyes and wears a black tank top, navy-blue ripped jeans, dark purple heeled boots, gray and light red striped armwarmers, her Meta Runner arm is on her right arm, a gray satchel, a mint green zip-up hoodie, a light purple crystal pendant, light blue and light green ear cuffs and light red goggles.

Season 2-3: Short blue hair, emerald green color eyes and wears a white tank top, royal blue and gray striped tights, a black and dark blue striped skirt, dark red heeled boots, a gray leather fingerless glove, a silver and dark blue striped armwarmer, her Meta Runner arm is on her right arm, a gray satchel, a dark blue zip-up hoodie, a light purple crystal pendant, dark blue and silver ear cuffs and light red goggles.
Personality: Kind, smart, caring, talented, brave, creative, helpful, serious, protective, generous, beautiful, cranky sometimes, curious sometimes, stubborn sometimes, motherly sometimes
Crush: Masa Shimamoto (Husband)
Friends: Meta Runner Allies
Enemies: Meta Runner Enemies
Family: Unnamed parents, Masa Shimamoto (Husband)
Others: Co-leader of MD-5. Former assistant of Dr. James Sheridan.

Sounds like Ashley Benson