9. Loghain (Dragon Age: Origins)
We witness this heartbreaking betreyal early on in the game after witnessing your player's origin story. Loghain was in charge of sending reinforcements to aid King Cailan and his army after you lit the beacon. However, Loghain does not follow through and decides to retreat instead.
While most people find this heinous, I am totally sympathetic to Loghain's character since he didn't do it for power unlike Arl Howe (will mention him later). He tried to act in the best interests of Ferelden to no avail. Understandable but you might not want him covering for you during a battle.