So after Ghost Game episode 51 Headless, I had the theory that SkullKnightmon, specifically Cavalier Mode, and by extension DarkKnightmon were potentially based on the Dullahan after the Unseelie fae is mentioned in said episode by name
I honestly have to wonder if Headless had any influence on Dullahamon’s development given that it has what appears to be an axe blade coming out of its flail-face
Also the choice of a flail-head presumably comes from the Dullahan being said to use a whip fashioned from a human spine as seen in the top image














