Voidless, puppeteer(?) & rerun is already done so its really just skulls & scars & tartarus that needs the songs done. Like I said in the announcement, Don't put too much focus in the mod otherwise you'll get burnt out faster than you think.
This wont be for chaotix or any character actually, it was only made to get back in the groove after going through a cycle of being burnt out and full of ideas.