Super Saiyan 2 (SSJJ)

Super Saiyan 2 (超サイヤ人 ツー) is the direct successor to the first Super Saiyan transformation. It is very similar to the original form in appearance and attainment; however, the power output is far greater, as speed, strength, and energy output all drastically increase. Gohan is the first person to attain the form in the manga, and he uses it while fighting against Cell in the Cell Games. Goku, Vegeta, Trunks, Goten and others soon follow, with Goku learning it in the Other World, Vegeta learning it on Earth, Trunks learnt sometime after the Shadow Dragons and Goten learnt in the restored Hyperbolic Time Chamber.

Appearance
The golden hair brought on by the original transformation becomes longer and rigid and stands up even more. Increased energy radiation causes the aura to take on a jagged, fierce flame-like appearance rather than smooth or flowing. Because the energy output and radiation is higher than that of a Super Saiyan, the aura pulses at a higher frequency. Muscle mass is barely increased, but energy output is multiplied manifold; such that greater amounts of the user's increased energy reserves can be used at once for much more powerful energy attacks without the arrival of exhaustion later.

Trivia

 * Although she doesn't have the aura or rigid hair, Super 18 is technically a permanent Super Saiyan 2.