Also im just gonna assume you know your zodiac already ;-;

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How did you get to the mansion and at what age

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Aries - As a young adult you were on drugs a lot, so you were drunk and followed Jeff there.

Taurus - Nobody knows how you got there, you were the first (Besides Slenderman)

Gemini - You came to the mansion as a ghost to haunt it. (Yes you are dead in this ;-;) 

Cancer - BEN brought you when you were the only kid who managed to beat him (Like literally you beat him at Majora's Mask even though it is supposed to be impossible)

Leo - Slender brought you there because your one of the people he selected to come here (Aka like Toby, he stalks you for most of your life)

Virgo - Toby ended up bringing you to the mansion since you put up a good fight for a teen

Libra - You were kidnapped by Zalgo as a kid, during a fight somebody found you (you couldnt tell who sadly) and brought you back

Scorpio - You were brought there when you were forced to give EJ's mask back, since you stole it and nobody could pry it from you.. Not even slenderman..

Sagittarius - You just randomly appeared, nobody minded. (No literally you just appeared out of thin air, NOT EVEN SLENDER KNOWS WHO THE FUCK YOU ARE)

Capricorn - You were born there (But nobody knows who your parents are)

Aquarius - As a teenager you went threw your emo phase, and it went a bit to far(Aka you start killing people for demonic rituals) so you kinda just belonged there

Pisces -  You were brought their as a child, really no reason behind it.