Who is tori?

Tori Wu administers Tris’s aptitude test at the beginning of the novel and realizes that she is Divergent. She is also a tattoo artist in the Dauntless compound, and she is said to have transferred from Erudite with her brother, who was killed for being Divergent. Tori has a tattoo of a hawk on the back of her neck, symbolizing the sun and reminding her how she overcame her fear of the dark.