Looks like starting in August, French Bread and ArcSys will start churning out new characters to download in UNIB II! Uzuki will be available in August, then Ogre in February, and Izumi in August of NEXT year.

Announcement: https://twitter.com/inbirthPR/status/1750135201400070548/photo/1

UNIB II on FAB: http://www.fightabase.com/gamesMain.aspx?id=1435