Zachary

Zachary was a telepathic student at Magic School. Over the course of his student years, he was played by his fellow students and has tried to tell Gideon about his problems with the school and how much he wanted to leave, but Gideon was, unfortunately, not listening.

In the end he used his telepathic abilities to cause troubles around the school to make Gideon suffer by conjuring up the Headless Horseman to behead the teachers. Later, he used Piper's power of molecular immobilization, to freeze the students. Then he used Gideon's telekinetic powers to point an athamé at his throat.

After he had the Headless Horseman cut off Phoebe, Piper, and Paige's heads (only because he wanted them out of his way), he went straight after Gideon. But the sisters managed to stop restore their heads and stop him in time. After some reasoning with him, he gave up the thought about killing Gideon and was returned to his family, much to his delight. Paige offered to bind his powers because he said he had a hard time accepting who he was, but in the end, he decided to keep them (The Legend Of The Sleepy Halliwell).

Powers and Abilities
Because Zachary is a telepath, he has the power of telepathy, so he can read minds. Thanks to the teachings of Magic School, he learned to use it to tap into anyone's powers to his advantage.

The powers he tapped into include: He attempted to tap into Enola's powers, but she sensed his invasion in advance and hid in a secret cave in one of Magic School's special rooms for protection.
 * Astral Projection (Mrs. Winterbourne) - To project an image and shield himself from suspicion.
 * Shapeshifting (Slick) - To impersonate Paige and get close to Gideon.
 * Molecular Immobilization (Piper Halliwell) - To freeze the students.
 * Telekinesis (Gideon) - To kill Gideon with an athamé.
 * Conjuration (Herman) - To summon the Headless Horseman and other entities.

Trivia

 * It is highly possible that he can combine Phoebe's power of empathy to produce a hypnotizing ability, because his powers are telepathic, which links to the thoughts of other people, while Phoebe's powers are empathic, linking to the feelings and emotions of other people.