Angels could have been made available for recruitment, but for that, you would have had to diligently help Archhild (in the quests where you had to choose one of the cities).
Playing as the undead – I think this is more of an alternative for those who want to act unconventionally (say, when playing the map for the second time). I haven't tried it myself, to be honest.
More screenshots of the statistics would also be interesting, showing the achievements, leaps (did you get into them?), combat losses, and reward hunts, etc.