1st, 2nd, & 3rd Forms
Freeza is of a race that can naturally utilize transformations. Instead of increasing power, Freeza's first three forms are used to supress his power. Besides power output, the only difference between these forms are size and minor details. All three forms expose Freeza's striped, pink skin. His upper body is covered in a white and purple form of biological armor. While his head has horns.
The first form is small, being slightly smaller than his natural state. The second form is large and very similar in appearance to King Cold, Freeza's father. The third state is mid-sized and showcases a long head that compares to the Xenomorph from Alien.
4th Form
Freeza's natural state. He no longer possesses horns, is slightly larger than his first form, and the white and purple biological armor completely covers his body. For a time, this was Freeza's final form, in which he could utilize all of his power by bulking himself up to maximize his power output to 100%.
Golden Freeza
The first of Freeza's forms that increase his strength. Created and named by Freeza after training for four months. His biological armor becomes shiny gold, his skin turns purple, his height increases by a couple of inches, and he becomes slightly more muscular. His power surpasses Super Saiyan Blue, but he initially loses to it due to making immediate use of it upon realization instead of training to utilize the form.
Black Freeza
After training for 10 years' worth of time in a Room of Spirit and Time he found on a conquered planet, Freeza created yet another form that clad himself in a new color. His lower body, neck, arms, and tail become black, while the guards on his arms and shins, as well as most of his head, become a dark silver. His torso and lower face remain unchanged from his natural state. This form's power is currently immesurably high, and was able to take down both Ultra Instinct Goku and Ultra Ego Vegeta in one blow.