All users of the kamehameha in Dragonball

In Dragon Ball, the Kamehameha is the franchise’s most iconic energy technique: a focused ki wave created by Master Roshi and later reproduced by fighters who trained in the Turtle School line—or by characters who can copy techniques after seeing them.

If we put together every character shown performing the Kamehameha across DB (including fusions and imitators), the list is:

Master Roshi, Goku, Gohan, Krillin, Grandpa Gohan, Pan, Tien, Yamcha, Goten, present Trunks, Gotenks, Uub, Goku Black, Baby (while possessing others), Vegito, Gogeta, Naturon Shenron (after absorbing Pan), Cell and the Cell Juniors, plus Majin Buu in moments where he imitates it.

Zamasu Gattai knows kamehameha, because he´s a Fusion half Goku Black, but he never uses it.

In the end, what makes the Kamehameha so memorable is exactly that: it spans generations, passes from master to student, returns through fusions—and even shows up in the hands of villains who learn by copying.