I’ve had this theory in my head for a while now about who Lin Bei Fong’s father is. It’s not Tokka, Toko, or even Taang. This is probably way out there but it’s just a theory. It’s Toph and The Duke (I can’t make shipping names). Here’s the little evidence that I have….
-Nobody would just offer their helmet (or another personal item) as a puke bucket for someone that they don’t like.
-He even comforts her while she’s using his helmet as a puke bucket.
-After the war is over they meet up (they are cute together ^_^)
Like I said this is probably way off from what’s really true, but one can guess.