Kokonoe: I think Kokonoe could fit in pretty well since she can use magic. Plus, she’s the daughter of two of the most powerful beings in the Blazblue universe. Might have some fighting prowess hidden in there somewhere.
Nine or Phantom: Definitely see Nine or at least that Phantom version of her making it as a new character too.
Jubei: Maybe Jubei could make it as well. Though, they’d have one hell of a time toning him down. Plus, his height would kinda make it hard to hit him. I still would like to see him make it, but there’s a lot of factors to consider there.
Relius Clover: Not so sure about Relius since he’d kinda just be a clone of Carl. Then again, maybe his fighting style would differ enough to make it work.
Torakaka: Even Torakaka could fit but she might be a Tao clone. Hard to tell. I’m sure their fighting styles would differ in some aspects though, as with Relius. Afterall, she’s a lot more composed and mature than Tao. Maybe she doesn’t bounce all over the place as much xP
Linhua: Eh, why not?
Imperator Librarius: Unlikely, but just added for the hell of it.