Well, any things you accept surely change you.
Especially some darker themes arised in novels like Cross Channel, Tsukihime, FSN, Demonbane and others.
I was mostly play RPGs like Grandia at that sweet time of paradigma forming, but already started reading novels, adn surely my life looks different after reading mentioned novels.
Of course not all novels have so much impact but still.
I even heard the Everlasting Summer do change people.
I wish I can read more, but most of my favourite things left untranslated.
Which includes: Demonbane 2, Full Metal Demon Muramasa, Sakura Wars 3-4 (I can read 1-2 since I understand russian), Witch on the Holy Night.