Who are you?

"Who are you? Can you tell me?" - Eggy

The subject of this article or section has never had an official name stated either via in the series, or by the creators; so it has been given a fitting name for it.

The subject's name may be revealed to be something different.

Black hole wiki pose

"Well, yeah, but like, Unknown Shadow is already infinitely small, being a singularity-" - Black Hole

This article or section is a stub. You can help the BFDI Wiki by expanding it with more information! (visual edit)

Pen 4 revised 2

"Unknown Shadow sounds like a boy, even though she's a girl, and that's just... WRONG!" - Pen

This character's gender hasn't been revealed by the creator, so when editing, use either the pronouns it or singular they when referring to the character in the article.

If the gender has been revealed, please provide a source when adding it.

The Unknown Shadow is a mysterious creature (possibly object) with a somewhat ominous voice who was chasing "Bozo".

When Golf Ball's flashback occurred while she was in the Science Museum, you can see Bozo running nervously, then hides behind a vase. A large club with sharp spikes sticking out starts to hit the vase, slowly breaking it, with the voice telling the ball, which the voice referred to as "bozo", to come out of hiding. Many think that this "bozo" is Golf Ball, though it isn't confirmed, or just simply the creature has mistaken her for someone else.

It could possibly be Pencil because she's the only one to call Golf Ball "Bozo", but she is voiced by Michael Huang while the Shadow is voiced by Cary Huang.