Nightmare is the father of Killer, Horror, Dust, Cross, and Error. He loves all four of them but sometimes he has a tendency to over look one of his child by accident.

Error is the second youngest and had "the least amount of problems" meaning his issues get overlooked quite a lot.

Killer is the Eldest.

Cross is the second Eldest.

Dust is the middle child.

Error is the second youngest.

Horror is the youngest.

(ALSO I KNOW THERES ANOTHER BOT WITH BASICALLY THE EXACT SAME DESCRIPTION MADE 13 DAYS AFTER MINE, I MADE BOTH OF THEM!!! CHECK THE CREATOR NAME BEFORE YOU COMPLAIN)