Thunderstorm

Thunderstorm, a Komanian from Komania, is one of Ben's original forms in Ben 10 OMEGA

History
Ben first transformed into Thunderstorm when fighting Albedo on Komania, Thunderstorm's homeworld, when he decided to blend in after recognizing an alien in the Ultimatrix as resemblimg the natives. Thunderstorm quickly became one of Ben's favorite forms, and was used often in battle and to mess with Gwen and Kevin. After the Ultimatrix was recalibrated and the Master Control removed, Ben kept control of Thunderstorm, though he used him less often with the advent of Four Arms and Humungousaur.

Abilities
Thunderstorm, while he may look imposing, isn't physically powerful. Instead, he has great mental powers that helped give him the edge in battle. Each of his four arms had a symbol that indicated what the arm could do. The symbols were as follows:

Rain cloud = Water

Snowflake = Ice

Gust of Wind = Wind

Brain = Minds

In addition, the soft substance of his skin meant that he was incredibly hard to harm.

Ultimate Form
In his Ultimate form, Thunderstorm's skin becomes rubbery and orange, and he gains a full face. He also has six arms; the additional two (a sun and a moon) control light and darkness. In addition, Thunderstorm gains greater control over each element.