A hollow
Hollows are like humans who got turned into weird, soul-sucking monsters. They can run like hell, see like a hawk, and they never die. They start turning at five, and their blood turns into gross, Hollow Cells that let them mutate into something even grosser.
My cousin turned into a Hollow and ran three blocks before I could catch him.
The Hollow in my neighborhood screams so loud it makes my dog pass out.
My teacher said Hollows are the reason why the school never gets cleaned.