Personality

Zack often speaks in foul language. He will occasionally swear in the situations he's in, and will not hesitate even if it is towards friends, It is also revealed that Zack never had any education of the sort, as hinted in his inability to read, and to explain things to him in long terms  makes Zack frustrated and unable to understand unless if it was explained to him in simplest terms. Because of his lack of knowledge and education, when he is put into a situation which requires using the brain to figure something out.

 

 

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 for 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 he's 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 isn't 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. He also hates being ordered around and told what to do because it makes him remember his past where he was seen as nothing more than a tool by his caretakers.

 

 

Zack has come into terms with being viewed as a monster due to his bloodthirsty and strength, and by accepting it he is able to see himself as 'normal'. Despite this, however, there was a time he wonders what it means to be a "human" if he is not one.

 

 

As a child, Zack was much quieter and reserved due to the abuse he suffered and obediently follow whatever his caretakers told him. After he couldn't take the abuse any longer and killed them after being inspired by a horror slasher movie he watched. 

 

Zack developed an impulse to kill, particularly people who are happy as he believes that they are the ones responsible for making him the way he is. Because most people in he knew in his life treated him horribly, experiencing kindness feels alien to him, resulting Zack became confused and irritated when someone is nice to him.