Nikki Ushima is a mechanic who works for Manhattan's Accident Investigation Squad. She helped Detectives Logan and Wheeler figure out who sabotaged Dr. Grant Tyler's motorcycle (CI: "Tru Love"), and she also managed to unlock the secrets of the coffin in which magician Miles Stone was supposedly trapped. (CI: "Vanishing Act")
Very little is known about her personal life, but she has mentioned having a girlfriend.