Isaac Foster  

Zack, アイザック・フォスター

Zack has a mental disability, whether it was something he had since he was born or he developed at some point in life is uncertain. This disability consists of him having a lust to destroying things, even to the means of killing. His blood rushes to a certain point and causes him to lose control of his urges. He will go into a short phase of destroying anything in his way until hes satisfied or until he rehabilitates. However, it can be regarded that while Zack is not academically intelligent, he is high in instinctive/survival intelligence, where he relies on his instincts to get him through situations, and can be seen as clever. Which could be how he was able to survive as a child, and up until now. And perhaps can even be described as an animal in a way. Zack is also extremely strong and rather fast, being able to run at rather incredible speed rates, and overall is actually a rather powerful character, which balances out the fact he isnt that smart. Zack is also VERY brutally honest, as he hates people who lie with a burning passion, and never ever sugarcoats anything he says. As a child, Zack was seemingly much more quiet and reserved. He was shown to never say a word throughout the manga specifically.