Kouha (コウハ, Kouha) is the Sister, or at least Self-Proclaimed Sister, of the Protagonist.
We know very little about who she is, both her nature and her history being mysertious. All we know is she has some deep connection to the Throne and has existed since its early days.
It is possible she might be one of the Naraka, or even be the Throne itself. Though we don't have enough information to tell.
History[]
We known very little about her history, only cognizant of the fact that she existed since the early days of the Throne, and was made to remember the history of each Era.
Abilities[]
She can send out an "ion" that would be able to manifest as a copy of a being recorded into the Throne, both the Gods and their followers.
Her understanding of these beings effects their powers, and due to their alien and hard to understand mindsets, they manifest weaker as a result.
Not entirely unlike the Servants in the Nasuverse.