The Speaker

The Speaker is a white figure, speaking a message.

A Mysterious Figure
Unlike other characters who have colors, they are all white. Not much is known about The Speaker.

Twisty Arms
At the end of The Message, their arms are twisted up.

Matrix Coder must've twisted their arms at the end by glitching the message. That explains the gibbersish.

Links
Dimensional: https://scratch.mit.edu/projects/237102357/

The Message: click here