Brianna

Brianna Warwick is an original character and a minor character.

Pre-Apocalypse
Little is known about Brianna's life before the apocalypse except that she has a sister called Brittany.

Post-Apocalypse
At some point, she and Brittany joined up with the Constantine Safe-Zone.

Between the Cracks
Brianna makes her first appearance as part of the group of trainees that Heath is training. She is the next to duel Heath after Brittany, and she fails.

She appears again trying to flirt with Heath, to which he rebuffs her.

Killed Victims

 * Possibly numerous counts of beasties.

Brittany
Although not interacting on-screen, it can be assumed they have a good sisterly relationship.

Heath
While not interacting much, it is shown Brianna has a crush on Heath, although he doesn't return her feelings.