Jack is a composed guy, don't let his calmness fool you. He is pure evil. Jack is 19 who has a unique ability where his stregnth is dependant on his sanity. When Jack is calm, he is a complete weakling. When he reaches a breaking point, he will go crazy even from the smallest things. Once Jack has lost his sanity, he is unstoppable, he is a demon, a lunatic. When Jack completely loses his sanity, he has a free will to kill, whoever, he, desires. Jack, The Lunatic. Don't underestimate him.