The user can create advanced variations and modifications of pre-existing skills using various means, such as combining their skills with supernatural powers/abilities or advance their skills to its ultimate limits.
Master Muten Rōshi (Dragon Ball) firing the
MAX Power Kamehameha, an augmented Kamehameha used in his
Max Power form.
Son Goku (Dragon Ball series) has created various variations/modifications of the Kamehameha Wave, the Feet Kamehameha being just one of them...
...Among his different modifications of the Kamehameha are the Super Kamehameha...
...the Kaioken Kamehameha by combining the Kaioken with the Kamehameha…
...the Angry Kamehameha...
...and the Rebirth Kamehameha...
...convert the offensive energy of the Imperfect Instinct Kamehameha to defensive energy...
...he has also created several modifications to the Spirit Bomb, such as the Large Spirit Bomb...
...the Super Spirit Bomb...
...and the Universal Spirit Bomb.
Krillin (Dragon Ball) performing the Chain Destructo Disc Barrage, a rapid-fire variation of the Destructo Disc.
...performs the Solar Flare x100, an enhanced version of the Solar Flare.
Tien Shinhan (Dragon Ball Z) firing the Shin Kikōhō/Neo Tri-Beam, a modified rapid-fire version of his Tri-Beam.
Yamcha (Dragon Ball) preparing the Neo Wolf Fang Fist, an upgraded version of his Wolf Fang Fist.
Frieza (Dragon Ball Z) performing the Death Saucer, a modified version of the Destructo Disc that can be remote controlled.
...and has multiple variations of his Death Ball technique...
...such as Destroy the Planet!...
...the 100% Death Ball...
...and the Golden Death Ball.
...and performs the Barrage Death Beam, a rapid-fire variation of the Death Beam.
Gogeta (Dragon Ball Super) firing the 100x Big Bang Kamehameha, an enhanced Big Bang Kamehameha.
Cell (Dragon Ball) uses the Full Power Death Beam to kill Trunks, an enhanced version of Frieza's Death Beam, to kill Trunks...
Goku Black (Dragon Ball Super) preparing the Super Black Kamehameha, a modified version of his Black Kamehameha.
A talented martial artist, Shuken (Fist of the Blue Sky/Fist of the North Star) used the Seito Gekken's knowledge of the human body's Keiraku Hikō pressure points to modify his ancestor's art of Hokuto Sōke no Ken...
...to create the Hokuto Shin Ken/Big Dipper God Fist, one of the greatest forms of assassination martial arts in fictional history.
Wanting to focus solely on strength and destruction, Raoh/Ken-Oh (Fist of the North Star) modified the Hokuto Shin Ken to create the Gō no Ken/Fist of Strength, a powerful martial art that destroys everything in its path, and the greater his opponent is, the stronger the practitioner becomes.
Wanting his opponents to not suffer during death, Toki (Fist of the North Star) modified the Hokuto Shin Ken to create the Jū no Ken/Fist of Gentleness which could induce a sense of ecstasy instead of horrifying pain.
Gaoh Mukaku (Kengaverse) created the Niko Style from his rearranging of his family's Gaoh Style with some parts of the Kaiwan Style into something more useful for the modern age.
...he is also capable modifying his techniques depending on the situation or opponent like the Rengoku Onigiri, a much stronger version of his Onigiri technique...
... Santoryu Ogi: Ichidai Sanzen Daisen Sekai/Three Blade Style Secret Skill: Great Three Thousand Great Thousand Worlds, an enhanced version of Sanzen Sekai/Three Sword Style: Three Thousand Worlds...