Board Thread:Theories/@comment-28898293-20160604222442/@comment-8846246-20160605175032

Mei is Student-chan:

Yes? But the argument is the same if you wanted to say Midori is Student-chan. Student-chan isn't a character, just a file, nothing else.

Yui is Witness-chan:

No. They existed at the same time, so that should be enough to prove it wrong.