Nightmare:
"So what if I'm crazy? The best people are~"
From: "Mad hatter" by Melanie Martinez

Dream:
"HEY! PUT ON A HAPPY FACE!"
From: "Happy Face" (idk the artist-)

Ink:
"I'm paralyzed...where are my feelings? I no longer feel things...I know I should"
From: "Paralyzed"

Error:
"Im not a fan of puppeteers, but I've a nagging fear someone else is pulling all of the strings"
From: "Discord"

Fell:
"I swear, I'll never be like them!...but I was just a kid back then"
From: "Older" by Sasha Sloan

Dust:
"Alright, here we go again"
From: "Down to the bone"

Bold: Horror
Normal: Killer
Italic: both
"You'll never take us alive!"
"We swore that death would do us part, they'll call our crimes a work of art!"
"You'll never take us alive!"
"We'll live like spoiled royalty"
"Best friends and partners...PARTNERS IN CRIME!"
From: "Partners in crime"

Blueberry:
"Come on everybody, Smile, smile, smile!"
From: Pinkie Pie's song, Idk what it's called

Cross, Underverse:
"They tell you 'You're the greatest!'...but once you turn they hate ya..."
From: "Arcade"

Lust:
"Fight so dirty but your love's so sweet~"
From: "Teeth" by Five Seconds Of Summer

(I'll think of more, recommend some for other sanses!)