Board Thread:Questions and Answers/@comment-33601685-20180724180506/@comment-35879635-20180822001752

Mr. E was originally going to be Echo Zane, but that idea was thrown out because there was too much to cram into such a little amount of time. (tweet claiming that: https://twitter.com/brothershageman/status/1030825204774187008)

But now, I think that he was just a robot that Harumi either found, or build? Although, I see why people are saying he could've been the Overlord with very similar eyes.