Super Saiyan 3 has been used by Gotenks, but the form was unstable and short-lived. Neither Fusion Dance nor Potara Fusion can sustain Super Saiyan 3 for long due to the immense power output.

Pikachu actually follow a similar principle: you can tell a Pikachu’s gender by looking at its tail. The tails of male Pikachu have pointed ends connected by more-or-less straight lines.