I think it's incorrect to say that Yagami Light was that way "from the get-go". The Death Note fell into Light's hands; he used it with the intention of serving a higher cause than himself - justice. It wasn't until quite a few chapters later that Light began sacrificing innocent lives to cover his tracks, and departing from his original sense of "justice".
I'm not distinguishing this to nit-pick, but I think the essential difference is that Light's insanity was brought about by his own pride and a lack of rational justification, whereas Lulu's, if he IS insane, is brought about by a power that he can't control or reason. (Light's downfall isn't the Death Note, it's his principles, in other words).
Edit: I guess you & I agree on the essentials, but yeah, except in the anime, he was a bit more sane in the beginning.
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I'm not distinguishing this to nit-pick, but I think the essential difference is that Light's insanity was brought about by his own pride and a lack of rational justification, whereas Lulu's, if he IS insane, is brought about by a power that he can't control or reason. (Light's downfall isn't the Death Note, it's his principles, in other words).
Edit: I guess you & I agree on the essentials, but yeah, except in the anime, he was a bit more sane in the beginning.