So, rather than a theory, this is more about pointing out some very funny coincidences I found while writting a What if for one of my fics.

Basically, I ended up drawing connections between these three characters and Yugioh's Duel Terminal.

Let's start with the main culprit, Cyno.

As many of you know, Cyno is filled with YuGiOh references.

But the main point I want to talk about is the fact that in Duel Terminal, there are two characters called Gishki Avance and Gishki Emilia.

Both literally have traits that Cyno has, they could literally fit in as his parents.

While Avance has white hair and a tan color of skin, Emilia has red eyes.

As for Collei, in Duel Terminal there is a trive composed solely by green haired characters, which first off, she'd fit in already lol.

But the main coincidence I found is relating to Collei's manga version and the Poison Winds in Duel Terminal.

Both literally are about a disease that plagued both the tribe and Collei, albeit there really isn't much aside from that.

The very same tribe specializes in Wind and Thunder... stuff that Tighnari does not like.

This is just a little funny connection I ended up making while writting a what if.