User blog comment:Galeforce's Wrath/Stating the obvious theory of: The Soul Bound Saga/@comment-25811329-20141227143508

From what I noticed, the Soul Bound Saga, also the Battle Maidens, are crossovers from Puzzle Trooper. They did change the names a bit. Based on their batches(groupings, whatever), the next units should be based on Athena and Medusa(Earth), then Zues and Manticore(Thunder), and Hades and Cerberus(Dark). They have no equivalent for Light element, so I'm not sure which god/goddess it will be. Jack Frost and Furious Nick were also borrowed from Puzzle Troopers.