Admiral_Pectoral said:
I was not referring to the actual name, but the D in his name. That has story implications that we don't really find out about until later.
And sure, characters might call him that but in the community most people simply refer to them by their nicknames. This is the same as the case in forum #192479.
The wiki I linked outright introduces them like this
I mean, which comes first, learning his full name, or learning what the D in a bunch of characters' name means? That's what determines if it's a spoiler. I unfortunately can't recall which comes first.
I'd also say it's not that much like the MHA situation, because in MHA the adult heroes are almost never referred to by their real names either in narration or by other characters. Someone who's read MHA is just as likely to not know their real names as someone who hasn't, because their names are usually only mentioned once and then almost never again. Blackbeard is still called by his real name by some characters, plus the significance of his name makes it more prominent in a reader's mind, compared to characters like Endeavor who literally no one calls Enji.
And sure, the wiki mentions their epithets in the very first line, but it also uses their full real names as the titles of the pages. I would support this alias going the other direction.