Morningstar is a valuable asset to the MDC, and despite not possessing any superhuman abilities, is a skilled fighter and gunman. She has assisted both Red Sentinel and Black Dragon; two vigilantes who work outside the constraints of law.
Morningstar respects Antonin Valakov (Red Sentinel) and his endeavours to protect Megopolis, though sometimes disagrees with some of his methods. She wishes that he would work within the law instead of outside it.
It is not clear when Tanner first met Megopolis Police Department officer Julia Vasquez, though she tells Nathan Lonergan that it was not long after she was appointed to Megopolis. Tanner does not make an effort to conceal her sexuality, although most assume she is straight, though her relationship is revealed publicly in Black Dragon: In A Lonely Place in an effort to harm Vasquez, forcing her to retire from the line of duty.