Kamehameha

History

The Kamehameha Wave literally means Turtle Striking Wave and was invented by Master Roshi. It took over 50 years for him to master. It is a signature of his Turtle School.

Technique

The Kamehameha is formed when cupped hands are drawn to the user's side, and the ki is concentrated into a single point between the cupped hands. The hands are then thrust forward, to expel the streaming mass of ki energy that has been formed. While doing this the user says the name of the technique, usually as "Kame-hame-ha" or "Ka-me-ha-me-HA" Ha is said when the wave is being released.

Users

Goku firing a Kamehameha from his feet

Master Roshi taught the technique originally to Goku and Krillin, then to Yamcha and Tien Shinhan.

Goku then taught his son Gohan  and the reincarnation of Kid Buu, Uub, the technique.

Goten learned the technique by watching his brother Gohan use it.

Vegito and Gogeta, which are fused forms of Goku and Vegeta, use their own powered up versions of the wave respectively.

Cell also learns how to use this technique through genetic memory.  

Super Buu and Kid Buu know the technique from absorbing Gohan and Gotenks.

Baby knows the technique through memories taken from Gohan and Goten.
 

Variations

Chocolate Kamehameha: A technique combining Good Buu's Chocolate Wave and Uub's Kamehameha after they merged into a single entity, The attack is charged and thrown like a normal Kamehameha but turns the victim of it's blast to chocolate like many of Good Buu's other attacks.

Side Facts

• Goten's version of the Kamehameha is slightly off and less powerful because he mispronounces the name when using the technique, he says Kame kameha.
• The technique has been used by Goku and Gohan with only 1 hand.
• Goku has used the wave through his cupped feet in the original Dragon Ball to propel himself at an enemy as an attack. It has also been used through the hands to propel the user to another area or out of the way of an attack.
• Despite popular belief, the name doesn't come from the Hawaiian King of the same name. It was a random word invented by Akira Toriyama's wife when he asked her to come up with a cool name for an attack.