Bashira

Bashira is an immortal human, who was turned immortal to be a "watcher/informer" for the Guardians. She lives within the human realm and "watches" for situations that might benefit from Guardian intervention. She was turned- made immortal- in the 18th century by Sebastian.  Her extreme courage in the face of adversity as well as her determination to keep her secrets convinced Bash (Sebastian), and his superiors, that she could be very beneficial to the Guardian race as a watcher. She of course knows of the Guardians existence, and has first hand knowledge of the dark forces that prey on the human race as well.

She has now been immortal much longer than she was mortal. Her immortality doesn't give her special gifts and powers like the Guardian force has, although she has learned well how to defend herself over the years.

As Sebastian was the one that brought her into her current role, she has a close relationship with him as a good friend, and he has remained her main point of contact within the Guardian realm. Mina is Sebastian's back up contact with Bashira, and has become a trusted friend over the years as well.

Tariq is her mate, and he is also aware of her secrets and her role as a watcher with the Guardian force. After being with Bashira for 15 years, he was also granted immortality to live with her and support her in the human realm. More as I figure it out...……...