Tiaral

The most unpleasant character: if Twice is just a conceited, nasty usurper without a soul, then Keko is the head of a terrorist sect with strange ideas, who has subjugated a lot of people and even an innocent dragon to use them for her dirty purposes. She is also a former priestess of Yanagi and, sort of, into femdom, to top it all off:

The followers of the Ikigai ideology strictly follow Keko's orders and call her "Mentor," "Great One," or "Mistress."