Downworlders are supernatural beings and hybrid creatures who inhabit the Shadow World. "Downworlder" is the widely used term to refer to beings that are said to be part human and part demon. The Downworlders are werewolves, vampires, warlocks, and Seelies.

Though the Shadowhunters and Downworlders do not exactly have harmonious relationship, they are civil and have a longstanding alliance and a treaty—the Accords—in an effort to keep peace in general.

See also