Killer
What is the black dripping from Killer's eye sockets?
Excess determination! (or DT/Determination tears)
Who and how much of their body does Dust hallucinate?
Papyrus/Phantom Papyrus and his head, torn scarf, and gloved hands!
What is Horror's famous pun he tells Aliza before "pranking her" by almost killing her?
"One head dog, coming up!"
Who's Nightmare's twin brother?
Dream!
What does Error call the AUs he destroys?
Who created Killer Sans?
Rahafwabas on Tumblr!
Who created Dust Sans?
Osteophile, Calvateyla, and a purposefully anonymous third member on the Ask DustTale Tumblr team!
Who created Horror Sans?
Sour Apple Studios! (on multiple platforms)
Who created Nightmare Sans?
JokuBlog on Tumblr! (also known as Joku)
Who created Error Sans?
CrayonQueen on Tumblr! (also known as CQ)
What is the name of Killer's AU?
"Something New"!
What was the exact line of dialogue Dust said to his brother before killing him?
There is no exact canon line, but it IS canon that Papyrus accepts his fate and lets his brother do it! (In fanon it's widely believed he says "It's better if it's done by me... than them." or "It'll be over soon.")
Whose eye did Horror steal?
A random royal guard member! (went unnamed in the og comic)
Is Nightmare canonically the KING of negativity or the GUARDIAN of negativity?
Neither, trick question! He is technically considered the EMBODIMENT of negativity after corruption! King is fanon, and guardian is before he "died"!
What's Error's favorite show?
UnderNovela! (NOOOOO ASGOROOOOO!!!)
What was the name of Killer's cat that Nightmare killed?
Where did Dust start his killing spree?
Waterfall!
Has Horror ever eaten human?
No! (didn't for seven years)
Is Passive Nightmare still alive and just taken over/in a coma and physically restricted by Nightmare?
No! Passive's skull was shattered by negativity overwhelming his fragile body, and although Nightmare is Passive corrupted and the same person technically, Passive is dead metaphorically and physically. Oh, this is confusing? Sorry, Dreamtale's a shitshow...
Why does Error hate/fear Fresh? (multiple answers)
What run did Killer accept Chara's deal and why?
How many Genocide Routes did Dust endure before snapping?
327!
What is the name of the side comic made by the original creator in which Horror Sans attempts to eat Aliza's (the human's) arm but gets hit with a rock over the head by Papyrus?
"Family Eating"!
What's the name of Nightmare and Dream's mother, and why did she turn into the tree she guarded?
Nim, when fatally attacked, used the last of the tree's emotional energy to make Nightmare and Dream before fusing herself into the tree to keep it alive!
What are Error's strings made of?
Magical code! (technically they're a physical manifestation of the conceptual threads of the unstable universes and his glitched magic combined)