She is neither. Or are you able to post panels from the manga proving otherwise?>>188458800
Riko the Greatest White Whistle of Orth will solve the problem as best as she can. As I do not know what will happen to those tied to the value system when Iru dies I cannot say. It all depends on that. Riko will of course wish for Iru to be released from her torture but the cost is what will cause the issue.
But I am certain the wonderful and creative young girl will solve the problem as best as possible. Oh, and no clue about Nanachi though, does it matter?
Riko is not a zombie, we have been over this.