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. Press C for Confronting Yourself mode (Another Demo appears beside (you/your oc)
I called it "You Can't Charge" because in TF2 (where the Demo is from, owned by Valve), charging with a shield on Demo makes you, well, charge. Except, it's significantly faster, twice as fast as a Scout (133% vs 250%)