Yeah, I know. The Alcala head is pushing it, but they're tying it to Demo-man somehow and the colour is off a bit to match him.
Mer-Man is different. He has two vintage designs based on the
classic style. A sculpt based on the cartoon wouldn't fit that style, which is old toys and artwork.
It's very arbitrary at times based on examples like those, but the line is a lot more consistent and defined than people make it out to be sometimes.
Why do
you want a filmation He-Man anyway?

Seems a bit off-the-wall, lol.