The Prototype Alex Mercer inherited much of his human self's personality, most notably his sociopathic and paranoid side. As with Dr. Mercer, he rarely takes human cost into account as shown throughout his journey to learn about his true identity, being able to murder scores of humans without remorse or hesitation. Unfortunately, after repeated betrayals and mishaps during his time away from NYZ after the initial outbreak, Mercer's worldview became increasingly cynical and nihilistic.