Q: The quest form says characters under 80 are on Children lines, does this include Vassals?

A: That's a good question actually; no, it doesn't include Vassals, because they are humans that were turned, unlike the Nobles.

Q: Can Vassals have non-natural eye colors? I was also wondering if there are any no-no's on how the vassals/aristocrats look ! Do they have to look like a regular human ? ?

A: Vassals should start with normal hair/eye, etc. but certain things may change that; mostly the mystical powers; extended or powerful use of mystical/magical abilities may change the normal colours to abnormal. For example: a vassal who can turn into a wolf may end up with wolf eyes in human form (or wolf-ears, a tail, claws, etc.) a vassal who has the power to manipulate flame may end up with firey eyes or their hair may become flame red, etc. these are colours not normally found on a human and thus it makes it hard to blend into human society when this happens.
Most Nobles are the same; they should have normal appearances unless they have been using some kind of mystical power too much.