Leona picks up on the yankee slang in Deuce’s dream early on, and the names of the “teams” (while the kanji is written as “dorm” Deuce pronounces it as “team”) also seem to be influenced by yankee-style naming conventions.
The kanji used in the dorm names of Deuce’s dream are from both how they sound and for meanings that imply strength/violence/rebellion. All together they are gibberish, but individually they reflect the yankee aesthetic.
In the case of Heartslabyul, for example, we have 覇痛羅武流: something like domination/supremacy + pain + entangle/net (this is a popular kanji for yankee) + military/warrior + style/flow.
Yankee-style writings like this are not really meant to be practical or sensical but more about the look, kind of similar to how heavy metal bands will use dramatic lightning fonts that are not always very legible.
The point is looking bold and intimidating, not to make grammatical sense.
Ortho comments on this aesthetic directly after hearing Epel’s plans for a future blastcycle, saying that his modifications “seem practically designed to tank performance,” as he does not understand that making sense is not the point: it is about the style.
Deuce’s pink leopard-print outfit his loungewear is also not uncommon for that aesthetic and he mentions bleaching his hair, also common with real-life 不良 and yankee.
The clothes that Deuce describes liking in the game sound very similar to vintage yankee fashion that integrated things like heavy embroidery and tiger and dragon motifs, all of which Deuce and Epel talk about in the gym wear vignette.
In the lantern event we learn that Deuce experimented with a variety of different hairs styles back in his 不良 days: he does his own hair as well as everybody else’s, even placing hair accessories “at aesthetically pleasing intervals” for Riddle, impressing Vil.
Deuce says, “I used to mess with my hair a lot. Why? To look more imposing… Uh, I mean, to look more stylish, of course!”
Twisted Wonderland Reference Note 