Subject_0 Slasher

It's The Main antagonist of PARTY.exe. He is one of several test subjects (alongside Subject_1, 2, and 3) in a research facility simulation. He is a stark white entity with a "bighead" face. In certain endings of his lore, his appearance shifts to include angelic wings and a crown, or a more distorted, creepy smile behind a white mask. You Were Invited To Subject_1's Party Along With His Friends. You Are Really Excited To Go There. But Until... You Saw Someone Sitting At A Corner. What Will You Do?