Richter wasn't popular within the Smash fanbase but he is extremely popular within the CV one from what I hear so characters like Black Knight wouldn't surprise me(him being a free unit im FEH has also helped his popularity a lot though I doubt it was in time to affect Smash).
Black Knight would be weird as an Ike echo. I can't imagine that bulky armor on Ike's frame not becoming a clipping nightmare.
That's sorta why I expect him as at least a semi-clone if he is in, Ike's ground attacks at least fit him, he just needs less acrobatic aerials and Up-B.
Actually, just the opposite.
Black Knight used to be in the Background of the second section of Castle Siege (on the throne), but he's been replaced by a differently coloured Knight.
Wait wait wait, he has? Can you shpw me a picture? Because if so, this really gives Black Knight being in a lot more validity