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He has short black spiky hair and dark eyes.
He acts pretty normal, minus the jumping out of a nine story building window and off cliffs. He likes risks but he's not always trying to be put in mortal danger.
He can turn any part of his body to steel, at least, we think it's steel. It's some sort of silver colored metal. It seems to be tougher than steel, though, because Ed's arm broke when he tried to punch Zack in the face. This ability also makes Zack partially immortal as long as he's in this toughened state.
He is one of D's best friends. He won't admit it, but he has a crush on Anne. Zack is also in the "Bro Club".
- "It's totally safe!......... Like, 75%." ~Zack