Havoc

A Lost Soul Awaits to be Freed.
Havoc's true origins are unknown, he doesn't show up in any of the games however, the little backstory he has, can be uncovered in a newspaper article.

Thermal
Havoc can detect enemies using thermal vision.

Unforgotten
Havoc can turn invisible for 30 seconds and stun any enemies he walks through (Can only be used once)