The Dink Network

It doesn't seem too difficult to implement some sort of basic morality system. Where it gets interesting is if you're going to take a fable approach on it. Where the character can look like an angel or a demon, then you'd have to implement a lot of new graphics.
OR
you could do something like;
if(&moral == 25)
{
///turn dink into slayer
}

if(&moral == -25)
{
///turn dink into dragon
}

But, if it's just going to change the ending, then don't worry about that.

It would involve a choice menu at every story checkpoint. Which actually would be very fun, and I plan on trying that myself sometime, I had started something like that in moon child, but only barely.

I think if you took your time with a morality system, it could be really cool.