I see the man from the bunker referred to as the Bunkerman amongst the fandom. That makes sense. Though I'm surprised to see it so commonly used for a term that doesn't actually get used in canon (at least not in the scanalations I read, that is)
I've been wondering about /why/ his name is kept a secret though. Like, even Lucas just calls him "That man." Like, is his real name going to be some earth shattering revelation? I can't think of how it would be.
You could assume he gave up his name afterall his friends were killed, but then how would Lucas know to respect that choice if That Man thinks Lucas is dead?
Will never reveal his name, like Scar from Fullmetal Alchemist, who has never had a canon name. I'm half sure Arakawa never even thought of one for him.
What I'm wondering is if his name is supposed to be important to us, the readers, or the characters. An Easter egg just for us, or an actual plot point.
Regardless, you can catch me calling him Entrymate. I've been calling him that since before I read the manga cuz @thathilomgirl tags him with his code number ETR3M8.
I realize its missing the N but that's how I've always read it.