Louis is known as the most human of all the vampires, and is forever tortured by the pain and guilt of having to kill humans in order to survive. He has had the habit of blaming himself for everything, even as a human, and this characteristic certainly has not changed even after he became a vampire.
Louis is perhaps best-characterized as the mild-mannered gentleman. Instead of becoming heavily involved in whatever is going on, he is more likely to passively sit back and gently watch. His weaknesses are painfully obvious and one might get the impression that there is little more to him than his pain and repressed emotions, but! Beware his wrath because once Louis's anger is aroused, there is very little to stop him. Enter fire. He is *the* pyromaniac of the Savage Garden (note Pointe du Lac, New Orleans, le Theatre des Vampires).
Just like the willow tree that will stand up better under heavy snowfall than a sturdy oak branch, Louis has a certain tenaciousness for life underlying his vulnerable facade, and is expected to live for quite a long time to come.