User blog comment:ChiisaiAoi/ENDED2/@comment-10778229-20130613151831

Have you considered the possibility that Karu, Millea and Empress Dalia are all siblings? I think that would be interesting, and have significance in hindsight-it would mean that when Karu was helping Teito and Ouka, he knew that they're his niece and nephew, a possible reason for his fondness of both of them.