Board Thread:Speculation House/@comment-11188061-20130720061227/@comment-1173941-20130720074426

PuffDragon wrote: The more characters we'll see, the more there will be similarities among them.

That doesn't necessarily lead to them being related other than being drawn by the same team. Agreed...

I'm not saying they aren't but even if they were, we have no evidence of this, other than "they look kinda similar".