There's something interesting about Wind and Flame's dynamic. So much so that I will question their relationship, in the least fujo way possible (though I can't guarantee).
Ninjas are not allowed to speak to one another, let alone be friends. They're trained to kill one another in the wild, most likely because being sold as property to I guess mob bosses, it's competition. The Village made their money selling the kids, they don't really care what happens to them outside.
I had originally thought Wind and Flame had been sold as a set, until I read about this whole killing each other thing. So here we have two guys, who were most likely totally best friends in the Village, risking or suffering horrible punishment just to be together, separated, reconnected when the Tenninto, and now they have a bond that keeps them so physically in sync that it's almost amusing. They fight in harmony, and finish each others sentences. And I still think they can telepathically communicate.
I realize it's not right to say that two men (or women) who are super bonded are in a romantic relationship, and friendship could just be the case. And you know, that's fine too! Either way, it's so fucking cute. They are so bonded and in love, either romantically or platonically.
They decided to be free together. They decided to be monsters together. They most likely lived together at the MA, maybe not in the same room but you get the idea. The Village did everything it could to beat social interaction out of its victims. Even Flash and Sonic, who had been allies, still dislike each other. But Wind and Flame had the exact opposite happen. They weren't just friends, they are one being.
So I'm happy they're gonna live. I need more of them. I want to know more, and hear their story more than anything.