Strengthened Super Saiyan 2 (SSJJ)

Strengthened Super Saiyan 2 is an improved version of Super Saiyan 2 achieved by further training.

Appearance
In this form; the user's hair becomes slightly more spikier and the electric streaks become slightly more rapid similar to Super Saiyan 3. The muscle mass is slightly increase or sometimes the same.

Power
While in this state the user's becomes equal to that of Super Saiyan 3 while retaining the power of stamina of a Super Saiyan 2. This form can also be obtained via Rage Mode and thus their power can somewhat surpass Super Saiyan 3 and even allow a user survive battles that a regular Super Saiyan 2 couldn't.

History
In the manga; Future Trunks has a different variation of this form known as Strengthened Super Saiyan 2; Future Gohan was able achieve this variation.

Strengthened Super Saiyan 2 (Demonic Version)
Rola and other Saiyan-Demon Hybrids or Demons with Saiyan DNA and vice versa are capable of using their own version of the Super Saiyan form. Their hair doesn't change colour or become gold and their power increases more.