'Constantine' TV series: Who is Zed?

The second episode of Constantine aired a few days ago with the addition of a new character to the series: Zed. We all know everyone should have an idea who John Constantine is, but does anyone know who Zed is? For those who don't, we'll break it down.

In the second episode, Zed becomes a companion of John Constantine due to her abilities of having visions, which she communicates through drawings. She is destined to travel with Constantine as she has been having visions of him for months.

In the comics, Zed has dark hair with white stripes. She's a psychic, and eventually she and Constantine become so close that they get involved in an intimate relationship.