User blog comment:KodachiZero/Chain Chronicle V3 on the Wiki + Q&A/@comment-26432452-20161124140141/@comment-359947-20161126014538

You can still get the old ring characters (Lindsey, Trystan, etc.) out of the challenge gacha. I pulled for Ioh earlier and got both Pamelas and someone else. Dunno if that will change, but they're available for now, it seems.