Zach

Zach H is the post-scratch incarnation of Mr. H

Zach's Chumhandle, which relates to the grief caused by his last name. AU also refers to gold on the Periodic Table, paralleling Red's chumhandle.

AU is also an abbreviation of Alternate Universe, which this obviously is.

Zach's symbol, which is tattooed on his arm, is an orange bullet. Interestingly, it doesn't resemble the shotgun shells he would use, but instead resembles a high-caliber bullet, like those used by snipers.

Zach's Denizen is Persephone, matching his web browser by the name of Kore.