Board Thread:News and Announcements/@comment-25762639-20150402075256/@comment-25094659-20150402234807

Mr B Natural wrote: Wait, what? First of all, how is this canon and not some random Reddit user who decided to role lay as Bill Cipher? And second, how do we know "Tad Strange" is a demon? Sorry, this question wasn't here before I commented.

The reddit site has proof for one, and secondly, he soinded a lot like Alex, not just some random fan. Thirdly, it was so big that, if it wasn't Alex, he should have heard about it and denied ir was him

Most likely because Bill calls him a square, implying that's he's an actual square, implying that he's the same species as Bill is. Also, same punny name "Bill Cipher", "Tad Strange".