I got all of these from google and the ones I couldn't find, I made up. Please feel free to correct me if I have them wrong.
Slenderman - "I wasn't born, so I do not have a birthday. Creepypastas don't even get older each year like regular people, so what kind of foolish question is this anyway?"
Sally - "April 5th."
Laughing Jack - "Being imaginary, I don't have a real birthday. That being said, I was created on Christmas, so we could use that."
Eyeless Jack - "March 15th."
Ben Drowned - "April 23rd."
Jeff the Killer - "June 2nd, but don't even think of throwing me a fucking party! I hate birthday parties, and I don't think I need to explain why."
Nina the Killer - "July 24th."
Homicidal Liu - "December 21st."
Clockwork - "November 6th."
Masky - "December 26th."
Hoodie - "February 5th."
Ticci Toby - "A-April 28th! Why are y-you asking? Are y-you gonna g-get me a p-present?"
Kate the Chaser - "March 26th."
Nurse Ann - "October 31st, Halloween."
Judge Angels - "April 2nd."
Bloody Painter - "October 1st."
Puppeteer - "July 25th."
Zero - "October 25th."
Kagekao - "December 29th."
Suicide Sadie - "August 2nd."

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An Interview With The Creepypastas
FanfictionHeadcanons in the form of an interview with the creepypastas! These are just my ideas of what the creepypastas are like. They're not supposed to be right, and it's okay if you don't agree with me. I don't have many, so if you have any ideas, please...