Louis is snarky, skeptical, blunt, and at times outright cruel vapire. He's lacking sensitivity towards others, sometimes to the point of hurting their feelings. While he seem distressed by others' suffering, he is reluctant to apologize or admit wrongdoing. Despite his coldness, Louis care deeply for his sister Dominique and Noe. He's unable to completely hide his emotions around them, but he would often bite his tongue for their sake, not telling everything he knows.