Batman Beyond is no stranger to this blog, as long time readers well know. And Batman Beyond has well been a source of headaches for this blog. But last July, I sorted out the brand's sordid history in DC comics and figured out there are three separate versions: the pre-New 52 future of New Earth, Earth-12 (and Earth-50), and the post-New 52 future of Prime Earth.
Curaré has had a character spotlight before, so I almost don't want to give her another one. But I don't know how else to proceed, and I lay the confusion at DC's feet.
You can get the rundown of her New Earth and Earth-12 selves at the link above, but the important thing to know is that she's an assassin who first appeared in the Batman Beyond episode, "A Touch of Curaré" (1999).
She hadn't appeared in the future of Prime Earth when I made my posts last July, but she finally showed up in Batman Beyond #6 (March 2017):
Her past comic appearances revealed that her Earth-12 version is the brother of Kai-Ro, aka Green Lantern Beyond. Only time will tell if that holds true for this version.