Lust will literally spoil anyone rotten if he has the chance to.
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Ink is extremely flexible to the point it's frightening. Nightmare attempted to snap Ink like a twig once but got concerned once Ink didn't break at all due to his flexibility.
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Ink will go bother Flowey's(or Temmie's if it's a Swap Au) and just bombard them with questions about what their soulless life is like.
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Error hacks into Roblox to bully kids while uncensoring swear words so he can bully them easier.
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Error would definitely play Animal Crossing like how Jacksepticeye does
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Dream grounds Ink if Ink gets so idiotic he commits arson
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Lust has somewhere where people can cry/rethink their life decisions/snuggle into provided blankets. He calls it 'The Depression closet'
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Ink has separation anxiety
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Nightmare has punishment rooms for everyone that is a part of his gang. Cross's punishment room is a room full of cows, cow plushies, and the walls are cow-patterned. Horror's punishment room is full of food that he can't reach. Dust's punishment room has the walls painted to match Chara's sweater and his room is full of plushies of Chara and Frisk that can't be destroyed. Killer's punishment room is a room full of mannequins that look like the people he hates but he can't kill them. Error's punishment room has a bunch of people in it that will touch him nonstop.
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Nightmare has special cells for Ink and Dream. Dream's special cell has the walls painted to look like Nightmare eating the corrupted apple and slowly corrupting. Ink's special cell is being locked in a room that is all white and being forced to do a puzzle that is only white while he only wears white clothes. Blue gets thrown in a normal cell.
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Nightmare is secretly incredibly sensitive to insults. He hides it well, though, and often hides away after being insulted. He's also uncomfortable accepting compliments.
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Sci has definitely attempted to analyze Nightmare's goop before. He has definitely tried to analyze and experiment with Error's strings as well.
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Nightmare's tentacles automatically search for pats, Nightmare insists they automatically seek to create negativity. Nobody actually believes this. Pat the tentacle, be rewarded with happy wiggles.
