This papercraft is a chibi Ultimate Gohan, based on the Dragon Ball series, the paper model was created by Juke. Gohan's ultimate power up when the full extent of his dormant power is released during the Fusion Saga. This power up was achieved by a special ceremony performed by Old Kai.
Although technically this ability is not exclusive to Gohan alone as the ceremony can be used to unlock anyone's sleeping powers, his was unusual in the amount of time it took to unlock due to his amazing potential unlike any other person who had undergone this ritual before.
Gohan activates this ability in a similar fashion to the Super Saiyan transformation, however the colors of his aura, hair, and eyes do not change. Only subtle differences are present, including more pronounced facial features, more upright hair, and a large, uncolored aura.
This power up is referred to as Super Gohan (Chou Gohan) in Daizenshuu 7, Strongest Warrior in Dragon Ball Z: Legendary Super Warriors, Elder Kai's Unlock Ability in the Budokai series, Ultimate Gohan in the Budokai Tenkaichi series, and Mystic Gohan in FUNimation's booklet for the Dragon Ball Z Season. When first attained, Gohan's strength easily surpasses all of his other forms. Gohan's power in this form is such that he completely outclassed Super Buu in his base form, casually pummeling the monster into submission, and it is on par with that of Super Buu after absorbing Goten, Trunks, and Piccolo, though Super Buu eventually outmatches Gohan due to his unique techniques and his absorbed victims' skills.
In the movie Dragon Ball Z: Wrath of the Dragon, Gohan is shown "powering up" into his ultimate state on several occasions during the battle against Hirudegarn, neglecting his multiple available Super Saiyan transformations. The databook Dragon Ball: Extreme Battle Collection refers to Ultimate Gohan as having fantastic power surpassing even Super Saiyan 3, however, Super Saiyan 3 Goku is shown to be more powerful than Ultimate Gohan in Wrath of the Dragon; Gohan cannot hit Hirudegarn or block any of his attacks, while Super Saiyan 3 Goku almost single-handedly defeats the monster. [Source: wikia]
About the Dragon Ball paper model:
Size: 33 cm
Format: .pdo line + lineless
You can download the papercraft model here: Dragon Ball - Chibi Ultimate Gohan Free Papercraft Download