Like all the other variants, performing the Majin Kamehameha is no different. The only difference is the coloration compared to the other Kamehameha variations. The power of the Majin Kamehameha is the same as or even greater than the Super Kamehameha.
This technique was first used by Majin Buu in his fight with Super Saiyan 3 Goku. After watching Goku use his Super Kamehameha technique, Buu decided to imitate it and fired the Majin Kamehameha at Goku, who deflected it back towards him. Buu then imitated Goku again by deflecting the blast himself.
This attack was also used in Dragon Ball Super during Buu's fight with Basil. Despite Basil's power up, he was still no match for the angry Buu, and Buu finished the fight by using an orange-colored Majin Kamehameha that caused Basil to collapse after a full force hit.
Appearances in games
The Majin Kamehameha made its first appearance in the Budokai Tenkaichi series, referred as only Super Kamehameha.
In Dragon Ball Online, it appears under the name Imitation Kamehameha and is exclusive to Wonder Majin skill tree.
It was eventually named in Dragon Ball: Xenoverse and is a Super Skill exclusive to members of the Majin race, such as its inventor Innocent Buu and a Majin Future Warrior. Mira can also use the technique as well due to the infusion of DNA from warriors such as Innocent Buu.