Berserker (Fate/Crossover - Isaac "Zack" Foster)

Berserker (バーサーカー, *Bāsākā*) is the servant of ??? in the ??? Holy Grail War.

"*Ohh... and if you die, then gimme a "I'm dead!" to let me know.*" – Isaac *Zack* Foster

## Profile

### Identity

Berserker's true identity is **Isaac Foster**, also known as **Zack**. He first appears as an enemy of the B6 floor when meeting Rachel Gardner, and then becomes an ally due to strange and unusual promises they made to each other.

He is a serial killer who is currently on the run due to his connections with recent murder cases.

### Personality

Zack is impulsive and prone to violence. He is chaotic, quick to anger, and doesn't hesitate to use foul language in any given situation. When he gets the urge to kill, he becomes giddy and uncontrollably violent. He is barely able to control his murderous impulses. Zack has come into terms with being viewed as a monster due to his appearance and violent tendencies. While he has no problem with murder and destruction, he does see dishonesty as immoral, often declaring how much he hates lies.

Zack labels himself as unintelligent, but he is really just uneducated. While he is illiterate and seems to have difficulty understanding large words, his rough upbringing has given him impressive instincts and strength, making him high in survival intelligence. Despite any common sense he may have, however, he frequently acts on impulse before he has the chance to think things through.

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 of the people that he knew in his life treated him horribly, experiencing kindness feels alien to him, resulting Zack became confused and irritated when someone is being nice to him.

## Abilities

Zack wields a scythe. His fighting style is very brutal, and he won't hesitate to kill anyone who gets in his way.

In spite of his own stated lack of academic knowledge, Zack has impressive survival instincts and strength, though his impulsiveness often overrides his common sense and ability to think properly.

Zack targeted anyone who looks happy, regardless of gender or age. From the flashbacks and article of one of his murders, it is shown that Zack killed his victims in back alleys or secluded environments where less people pass by, which implies that Zack either lured his victim to an alleyway or waited until his victim is in a place where there are the least or no people passing by during the night. Zack would usually give his victims 3 seconds to try to run away from him to make them feel more horrified when he killed them. Before becoming a floor master, Zack used a knife to repeatedly stab his victims to death, but then switched to a scythe after he found it and his knife had became rusty. Using his scythe, his killing method became crueler as one of his victims is shown to have been beheaded.

### Noble Phantasm

#### **Night of Merciless Slaughter**

Zack's right eye starts glowing bright red upon activation. Zack charges straight at the target enemy, swinging his scythe brutally on the victim, and finishes with one more swing aiming right for the head for one more brutal attack.

## References

https://satsuriku-no-tenshi.fandom.com/wiki/Isaac\_%22Zack%22\_Foster

https://vsbattles.fandom.com/wiki/Isaac\_Foster