Oh, that's fun.
I listen to a lot of music when I draw and it does influence me. My current comic project was actually a music project, so I have some ready answers.. and some more difficult.
For Hlaluu, I don't hesitate, that would be something like that: (In the music project Hlaluu was a kind of personification of sarangi) and I think it does fit the mood of the first pages, when he is introduced.
For Zerwan, it's a bit more complicated. The first ever introduction of the character is with several other characters, so I could not give a music for him alone. So I'll extend to the next two scenes where we really meet him, and I propose the following: (obviously it's not completely fitting as it's about a longtime traveler, but what fit are the general theme, the mix of cultural influences, and the clean/harsh vocals, all things that were defining Zerwan in the musical project).