Executive Meddling: Arc Systems does not like it when people post Blazblue videos on youtube. Not even gameplay videos. Good luck finding those gag endings, normally only one or two of them are available online at a time, if you are lucky.
Nu-Gundam: v -13-'s 4th color in her DLC pack is a Gundam.
Gay Man: Bang wearing his pink costume. His butt whistles when he flies!
Clap Loop / The Clapper: Again, Carl. This involves positioning Nirvana right behind the opponent and repeatedly keeping the opponent juggled in the air while throwing them. Only certain characters can escape this loop, and only under certain circumstances.
Lamb-Chan: Lambda-11, Nu-13's much-nerfed replacement in Continuum Shift.
Lambchop over in America.
Hakumen vi Britannia, for his new voice clips in Continuum Shift which sound like Lelouch.
There's also Jin vi Kisaragi.
Hype Dog: The Ensemble Darkhorse big fluffy dog that appears in one of the backgrounds in Continuum Shift. Shown here.
Asstral Finish: Mu's Astral Heat, both for poor animation quality and gratuitous ass shot.
Assdrill Finish / Asstroll Finish: Relius' Astral Heat, where it's heavily implied he rapes the opponent. Since the first footage of it was done on Ragna, the first one seems to be the more popular.
One of Us: The localizing team did a pretty good job of translating all the medals/achievements in BBCS2 and still managed to add in a few Incredibly Lame Puns. Twelve of these medals involve Legion Mode, a mode where the player has to go through anywhere between one to dozens of bases on a map, where the number of bases depends on the difficulty of the map, and fight the characters occupying these bases. Guess what's the name of the medal awarded for clearing the highest difficulty? It's called What You Say. Yup, One of Us.
Ragna and Hazama are also Leon and Alto where their roles as protagonist and antagonist are switched. For Irony, they're also shipped by voice actors in real life.