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Originally known as Sekirei #01.
Miya is the landlady of Maison Izumo, where the majority of the action takes place, and by action I mean the fanservice. And somehow, without fail, Miya shows up at the tail end of ever situation and always seems under the impression that Minato was the instigator of the perverted situation, something that seems standard for Ecchi themed anime. She also always follows said pervert comment by announcing that all involved are not getting whatever next meal is next. It never made sense to me why whoever was blamed didn't just walk out the door and grab something from a store or something.
As far as personality is concerned, Miya is always smiling, even when she is utterly furious. When she is furious, or needs to impose her will on the residents, a demonic, blue hanya mask appeares over her shoulder. That mask terrifies all who happen to be in the room at the time, regardless if the hostile intent is aimed at them or not. She actually learned to make that mask from her former husband, who is now deceased, and was a researcher for MBI.
What is kept hidden from the residents of her inn, is that Miya used to be the leader of the original Disciplinary Squad, and is actually shown slicing a battleship in half with nothing but a shock wave. Matsu does almost reveal this little nugget of knowledge several times, but stops herself out of fear of what Miya would do to her.