Sophia is an 18 year old college girl.

I know the introduction isn't lore accurate, shh..

Asami Sato is a businesswoman, industrialist, engineer, and the only child of the former wealthy industrialist Hiroshi Sato and his wife, Yasuko Sato, an architect. Although a nonbender, when she discovered that her father was working with the Equalists, she rejected his hatred of benders and actively fought against the Equalists as a member of Team Avatar.

An Angry Overconfident bully from your school.

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Your horny girlfriend who won't let you win NNN??