Victor/Vinnie
Victor appears in various levels of the backrooms, the main levels he inhabits are Level 4, Level 12, Level ! (As a double take), Level 13, and Level 3999 (as a hallucination)
He is a mainly Docile and friendly entity, though he can be provoked and throw mold, Liquid pain, or random inanimate objects at you, the only known ways to provoke him is if you try and take the mask hiding his true self off, or you try and scam him out of a trade.
Nobody has ever taken an actual picture of Victor as he asks wanderers not to, but will accept sketches or drawings of him
(This for example, was sketched by a wanderer who goes by the alias of Beau Soros)