Cassandra would be absolutely perfect. People seem to forget about her. Everyone wants Stephanie back, but no one's really pushing for Cassandra. Which is sad... I adore her and find her very relatable.
I wonder whether that's partly due to Steph fitting a bit more easily into the mainstream's mental picture of Batgirl: cute, peppy & spunky, if a bit inexperienced. Cass, by contrast, had the face-kicking aspect of heroism on lock, though her social & linguistic issues were a recurring Achilles' heel. Frankly, the Batclan already had & has plenty of scrappy whitebread kids, so benching Ms. Cain strikes me as a misguided step back.
Oh, don't we wish. For one thing, the Beyond suit's low-drag layout & nifty synapse-activated features (wings, boot-jets, etc.) seem tailor-made for a character as resolutely physical & instinctive as Cass. For another...well, there's just something about a full-face Batcowl(TM), to say nothing of that black-widow color combo. Finally, from what memory & a VHS copy of Return of the Joker have lent me, the Beyond-verse is set far enough forward to give most of those legacy-Batketeers their time in the spotlight before the next generation steps up.
Oh, lest I forget: see if this track doesn't put you in the mood to visualize Mme. Cain cutting loose: [link]
Definitely. Someone needs to really make good use of Cass' character somehow; she's gotten sloppy seconds for the last few years, and it's a damn shame. The BEYONDverse has a lot of potential that I hope DC is smart enough to use properly.