I have now figured out how to do stuff like this. and i can also see why they probably don't want to do something like this. (Updated, added offical hellbreaker assets, its a w.i.p though) (it is not a w.i.p now) Double-click flag so that the music syncs! You can replace characters by going into their costumes and replacing the poses with your characters' poses. You can also change some of the animation code if you want it to look different. You can also change the note skin of each arrow set (Which was introduced in the project i used to make this.)
If the chart is timed incorrectly, then its likely due to hade having spam on their side. the chart will likely be changed to fix this. (However it could possibly cause the opposite and if it does it will probably have to be fixed more) Hade and Hellbreaker/Hadephobia by @ThatPizzaTowerFan Hade Idle by @ThatPizzaTowerFan, Poses by me. The old assets was a recreation of the official hellbreaker svg (which was lost at that time), they were made by me. Later the official hellbreaker sprites were found. i used @SquigglyTuff 's "Add yourself/your oc singing Disability" project for this since it was perfect to use to create this (albeit the modchart) Also i accidentally shared this so if there's any mistakes or if the chart changes then its probably because of some stuff i didn't fix before sharing or issues outside of this project.