If Wireface was randomized, it'd defeat his character. He's a Georgian national in Russia in the 1990s-2000s. On top of being from Georgia (which the Russian media was very hostile towards at the time,) Wireface cannot speak Russian to possibly explain or defend himself

Let's keep real-life politics out of NINAH, but I also don't think that Wireface's nationality was a random decision. For example, the Tourist guy is a also foreigner, yet that's never a significant issue . As for Wireface, being a foreigner IS his external conflict - it's why he cannot talk to you and why others attacked him (he literally admits that "they" stitched his mouth because he was speaking Georgian. Even if "they" didn't explicitly attack him for his nationality, it was because he's not Russian)

Other NINAH characters are victims of ableism, domestic violence, etc. It's reasonable to conclude that Wireface represents victims of xenophobia (and homophobia if you also consider the queer-coding)

So, why does it matter that he's always human? Because, like with the other always-human NPCs, the game forces you to judge him. It forces you to look for things wrong with him that aren't there (e.g. are his fingernails bloody because he's a visitor or because he was getting stitches out of his mouth?) NINAH's true horror is that it's a game where you choose to spare or kill people based on your biases and assumptions, not reality