Gwyn

Gwyn is the leader of the Scavs and serves as a primary antagonist in Season 2.

Pre-Apocalypse
Not much is known about Gwyn's life prior to the apocalypse, though it is assumed that during the initial outbreak, she suffered a loss that led to her becoming unhinged and turning her group into what they are today.

"Unstoppable Force"
To be added...

Killed Victims

 * Presumably multiple members of Bryce's Group
 * Presumably multiple infected

Trivia

 * Gwyn is the second primary antagonist to appear in the show.