The Charge glow of a specific character is the graphics used for each character when they perform the Supercharger move, which is where the name derives from. However, the charge glow actually pre-dates the Supercharger, but was at that time unnamed. It was, and still is, present when the character carries out a move that is particularly strong, results in a clean hit, or during an Unblockable move. As an example; those of Mishima blood (Jinpachi, Heihachi, and Kazuya Mishima, Lars Alexandersson, and Jin Kazama) all have lightning effects as their charge glow, Paul Phoenix and Marshall Law have a yellow twisting flower-like effect, etc.
When the glowing effects are shown in-game, they are usually accompanied with vibration effects from the PlayStation controller.