Priestess Princess of the Light or something. To be honest I don't always pay attention; her titles seem to change. "Of the Light" though, I know that's part of it for sure. You should look her up.

[he just can't promise Six will be able to get rid her afterwards. Somehow even after moving out of the apartment he shared with her they still meet for semi-weekly tea drinking. Why or how he found himself conned into that is a mystery to him.]

Is this a sort of - regular thing? Like there's always going to be one on your world? Or is it that there's some great threat your world is facing? It tends to be one of the two with champions of the world, I've found. Not that the two are always exclusive, mind.