In Dragon Ball Z, who was the first character to go Super Saiyan 2?

In Dragon Ball Z, the first character to go Super Saiyan 2 is Gohan. After reaching an emotional breaking point when witnessing the brutal murder of his close friend Android 16 and the subsequent anger-driven transformation into Super Saiyan 2, Gohan unleashes a remarkable power surge, showcasing his immense strength and surpassing the limits of a regular Super Saiyan. This pivotal moment in the series solidifies Gohan as a key player and marks an important milestone in his character development.