User blog comment:IamJakuhoRaikoben/Chapter 492: Elder Sister and Younger Sister, Review./@comment-25111584-20160704162214/@comment-7418318-20160704213842

Can we even call them underlings? I think they are more like parts of Irene, almost like we (or at least I) consider Celestial Spirits as part of the summoner's magic, part individuals.