Honorifics: Ace

Ace refers to Riddle as “Housewarden Riddle” or “Housewarden.”

Exceptions: During Book 1 there is a one-time instance of Ace calling him “Riddle,” without an honorific, as it is the scene where he is announcing that he will beat Riddle in a duel, become housewarden himself and order Riddle to remove their collars. (In the novel Deuce pointedly comments on how Ace is prematurely dropping the honorific from Riddle’s name.)

In Riddle’s dream of Book 7 Riddle is not a student at NRC. At one point Ace stops himself from saying “Housewarden” to say “Riddle-san,” instead.

Ace typically does not use any honorifics with any of the other first-year students.

There are exceptions for a one-time “Sebek-kun” and one-time “Jack-kun,” and he will sometimes add “-kun” to Deuce’s name to tease him, while both Ace and Deuce once add “-kun” to one another’s names at least once when teasing the prefect.

Ace refers to all the second- and third-year students as “first-name-senpai,” once calling Trey “Trey-sama” in a vignette.

Exception: Ace does not use “-senpai” with Azul in Book 3, referring to him just as “Azul,” and he might not use an honorific with Azul at all in the main story.

(This also applies to Jack and Deuce, who are normally more polite than Ace, but none of the three first-years ever use “senpai” with Azul in Book 3.)

If you are looking into honorifics for fanfic purposes, Ace’s nickname for Deuce might be something of a challenge: EN has adapted the insult in at least two different ways that change according to the situation, but it is consistent on JP.

The literal word is “majime” for “serious” or “diligent,” because Ace is mocking Deuce for trying to be an honor student.

EN will sometimes interpret it as “Loosey Deucey” and, other times, as “tryhard.”

(He uses the insult with Jack at least once as well, in Book 3.)