Was talking to JMC about this on DeviantArt, and he's interested if you have any feedback on what he has publicly available for the adaptations of your work.
This is the song he published for Mutkifer: https://soundcloud.com/nikita-efremov-865151319/fnf-notmk-20-non-potes-fugiendum...
Note on the song, from JMC: "the vocals there are temporary, one person will help me make new versions, in general the song can also be slightly reworked. And yes there is a reference to SMB3 Game over sound effect"
And here are the renders for Sophie and Mutkifer, which he provided me with
