I think, for the more dark or supernatural parts of the story, pieces from the Witcher 3 soundtrack could fit pretty well.
I've also seen people suggest Bloodborne, which I find fitting for Trolls n' the rest, for obvious reasons.
....In fact, if someone took the soundtracks of Bloodborne and Spirited Away and mushed them up together into one unholy amalgamation, I think they would get a score rather representative of the comic.
Also a suggestion that would be most fitting for ironic purposes:
https://youtu.be/A3yCcXgbKrEAnd, of course, the song that has Onni in a nutshell
It's a jungle out there
Disorder and confusion everywhere
No one seems to care
Well I do
Hey, who's in charge here?
It's a jungle out there
Poison in the very air we breathe
Do you know what's in the water that you drink?
Well I do, and it's amazing
People think I'm crazy, 'cause I worry all the time
If you paid attention, you'd be worried too
You better pay attention
Or this world we love so much might just kill you
I could be wrong now, but I don't think so
'Cause there's a jungle out there
It's a jungle out there
It's a jungle out there
Violence and danger everywhere
It's brother against brother
Pouding on each other
Like they would make a mess
It's a jungle out there
It's a jungle here too
You got a tap right on your phone
A microphone and camera check on everything you do
Call it paranoia as the saying goes
Even paranoids have their meek
I'm not the one who's crazy, I'm not afraid of them
They're afraid of you and me
I could be wrong there, but I don't think so
'Cause it's a jungle out there
It's a jungle out there
It's a jungle out there
Even the cops are scared today
So if you see a uniform
Do exactly what they say
Or make a run for it
I'm only kidding with ya
'Cause it's a jungle out there
It's a jungle out there
For some reason, I kept thinking Loreena McKennitt. I have no idea why. >_<
I believe her music would fit quite nicely in some of the calmer, relaxed or spiritual moments of the comic!