The black guy from "the good place" isn't a cuck, just a wuss. I'm curious though, what makes you think the guy from "Son Of Zorn" is? (haven't watched the show).
Spoiler Alert (but just barely)!
He's the classic "sensitive guy" and his fiancée is a reformed bad boy chaser. She's clearly going to hook up with her ex (Zorn) at some point, even if only for a brief fling.
End (kind of) spoilers.