The Charge Shot was first introduced in Mega Man 4 and has been featured in most games of the series ever since, with slight variations between games. Holding the attack button will allow a Charge Shot that can potentially deal two or three times the normal amount of damage to enemies and bosses.
In Mega Man 4, firing a Charge Shot caused Mega Man to flash white, green, and blue for a fairly unnoticeable amount of time after, whereas the version in Mega Man 5 and Mega Man 6 causes him to flash red, black, then cyan. In Mega Man 4, Mega Man could maintain the charging process even if he was damaged, but not in Mega Man 5 and Mega Man 6. In Mega Man 7, the charged shot is not very big, but Mega Man could maintain the charging process even after damage.
Proto Man's first use of the Charge Shot during the main series was during his boss battle in Mega Man 7. In Mega Man 9 and Mega Man 10, when he was added as a playable character, he featured the Charge Shot as part of his moveset, closely resembling Mega Man's Mega Man 4 style Charge Shot.
In Mega Man 7, Mega Man: The Power Battle, Mega Man 2: The Power Fighters, and by extension the port Rockman: Battle & Fighters, Bass could charge his Bass Buster, but Mega Man & Bass established that he would instead fire weaker shots with rapid fire in multiple directions.
Mega Man Maker
In Mega Man Maker, Mega Man and Proto Man have the ability to use the Charge Shot. By modifying character settings, Mega Man can enable or disable the use of the Charge Shot, and if it is active, the type of Charge Shot from Mega Man 4, Mega Man 5, and Mega Man 6 can be selected and used. Proto Man can only use a version of the Mega Man 4 Charge Shot that cannot be turned off. In order to use Charge Shots, Mega Man or Proto Man must have their respective Mega Buster or Proto Buster equipped. When a Charge Shot is fired with a limited energy Mega Buster or Proto Buster, it will take up 1 bar of energy and also flash to the corresponding color that the charge shot has.
If the character is damaged, the charge will not disappear if the fire button is held, even if the character is Mega Man and regardless of his charge shot settings.
- Both Proto Man's and Bass' first use of the Charge Shot as playable characters was in the spin-off game Mega Man: The Power Battle.
- Dr. Light's Charge Shot modification to Mega Man's Mega Buster in Mega Man 6, is weaker than Dr. Cossack's Charge Shot modification to Mega Man's Mega Buster in Mega Man 5.