Before his madness,  Sephiroth maintains an outwardly aloof and professional demeanor during his time at Shinra. He is known for hardly mingling with anyone besides his friends, and being indifferent toward his fans. He can act humane and caring in contrast to his reputation. Sephiroth is intelligent and respects those he deems worthy. He has a dry sense of humor. Sometimes, he can be frustrated and caught off-guard. As the strongest SOLDIER, Sephiroth is confident to the point of arrogance, yet has no interest in personal glory. After learning of the experiments that led to his birth, Sephiroth falls into insanity, becoming murderous, ruthless, and vengeful, yet retaining his calm and cold demeanor. He develops a messiah complex, proclaiming to be "the chosen one" destined to lead the planet. He becomes sadistic.