I really like Frederick. His backstory is epic, his skills are great, and having a berserker clad in heavy armor is killer (for the enemy)
However, I have a soft spot in my funny bone for Sir Alastair. He blatantly talks about torturing people during a dinner party, makes goo-goo eyes at the Snake Cult Priestess, is literally trying to hunt down another one of your companions, and yet follows your party without a care in the world even as (if) you ally with the noldor and the Order of the Dawn, hunt down heretics, and try to recreate the glory of Pendor. I find his obliviousness funny.