Let's start with the idea I have for MissD76
For starters, I imagine her theme sounding more like something Helloween-like, but containing this melody
And it reminds me partially of one of the riffs from Helloween's "Ride the sky"
Another good option is this melody:
Iron attack even made a cover of it mixing this melody with Helloween's "Future world"
I might add something else to this theme idea since it can even fit the "T&F meets metal what-if series"
Now, let's go with ideas for Kim/Kimmy-Faith-Raven
I imagine Kimmy's theme sounding something more like gothic metal and it might contain traces of this T&F season 8 theme, but with a much darker melody
How dark? Pretty much like one of Sakuya's themes from Touhou
There's even metal versions of it, maybe Kim's theme can end up being a mash up of these with a more gothic sound. The version by the doujin circle "Kissing the mirror" is more of Kim's style
Here's the version by Iron Attack
Definitely Kim's must be as heavy as the Iron Attack version, and keeping the gothic arrangements of Kissing the mirror's version
Now let's go with Leafy/StarlightRiu
's SLP theme ideas. As I know so far, she's a huge fan of NANO and the most appropiate metal band I found for the style of her theme, is of course, Demetori
. We could imagine her theme based on Nano's melodies
And here's some songs by the band Demetori that might help me to imagine Leafy's theme style and general sound