@kel She came to me in music, in the "Undertale" main theme (https://www.youtube.com/watch?v=EBhFHJMVfiI). Some of that story may be read here: http://monophylos.livejournal.com/4145.html
For a long time I felt that somehow "She" literally inhabited this song, the way that a _genius loci_ ("spirit of a place") inhabits a particular spring or a grove of trees. I am less certain of this now, and in any case I commit to no definite interpretation of what Manon is. She is the force that I perceive within #Undertale that moves me as nothing else has, the power that makes me want to change myself.