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Correct me if I'm wrong, but doesn't #2 only apply if they were not used as an evil enhancement? Or do they revert to both good and evil in discard?
1 & 2: Agreed3: For the Manasseh part, if your human evil characters are protected from discard or harm (in general, not just from opponent's), then they cannot be targeted for discard. They don't go anywhere, but you cannot use them as part of the ability.4: If you use Book of the Law, you cannot remove the spear from the game. As above, you cannot use the rest of the ability, since you could not activate the trigger.