Geppetto is a major character, albeit one that's rarely seen, in the comic book series Fables, written by Bill Willingham and published by DC Comics as part of the Vertigo imprint.
His actions are responsible for the entire premise of the comic book, in that he is the being known as 'The Adversary' who masterminded the conquest of the Fable homelands, forcing the Fables to flee into the mundane world.
Geppetto's solution seemed obvious, to create new children, initially older sons, operating under the assumption that they would prove more mature than Pinocchio, then turning his hand to daughters. The Blue Fairy continued to visit, and, every now and then, would take a liking to one of the children and turn them human. Having also been hurt by Pinocchio's vagabond nature, she altered her magic to include bonds of loyalty to Geppetto and of fealty to hearth and home.
As time went on, the process became habitual, and it wasn't too long before every major ruling official within range had been replaced by one of Geppetto's duplicates, and thus, through the Blue Fairy's magic, all of them were loyal to him. However, the Fairy ultimately tired of the game, putting Geppetto in a problematic situation. With his co-conspirators hungry to expand the territory that they controlled, the inability to turn the duplicates human was a problem. Geppetto began to research the magic himself; many of the lords under his control had court magicians in their service and were able to send them to Geppetto to instruct him in the ways of magic. Within a short period of time, Geppetto came to understand how the Blue Fairy performed her magic, but he lacked her unique magical nature, which acted as her power source. During her next visit, he solved that problem by attacking her and hooking her up to a system that allowed him to create elixirs from her body that could turn his duplicates human.
Expansion became the key to maintaining his empire, and Geppetto had by now developed a taste for ruling, taking the view that it was better that he should be in charge than someone who might prove to be less benevolent. However, a new problem had arisen. His empire had expanded to the extent that the nearby leaders were complete strangers to him, so it would not be possible to surreptitiously replace them. Subterfuge was no longer an option. Fortunately, by this point, Geppetto had control over a considerable military force, through the various lords under his control. Augmented by magically summoned creatures, his armies were able to overwhelm most opposition with some ease, especially since few (if any) expected the attacks. Geppetto also created the figure of the Emperor, a massively imposing figure, heavily armoured, to be his figurehead to inspire martial loyalty and to strike fear into enemy forces.
The empire continued to expand, operating on a fifty-year cycle of expansion and consolidation. Geppetto himself tends to stay out of direct control, allowing his sons and daughters, now numbering in the tens of thousands, to handle the day-to-day running of the empire. Geppetto prefers to remain in his cottage workshop, only occasionally getting involved to set policy and broad goals for the empire.
At the time of the Fables stories, the empire has absorbed all of the European Fable worlds (with a few exceptions, such as the kingdom of the North Wind) and is beginning a new expansion cycle, launching an assault on the Arabian fables.
His next encounter with Fabletown was the one-man invasion of the Homelands by Boy Blue. Armed with powerful magical artifacts, Blue caused a remarkable amount of disruption, slaying several Imperial governors as he made his way closer to the Imperial capitol, where he infiltrated the Emperor's throne room and decapitated the Emperor, who reverted to his original wooden form. Captured by the Snow Queen, Blue was brought to Geppetto, and the two conversed for some time, while Geppetto worked on repairing the Emperor puppet ready for returning him to a living form; Blue also returned Pinocchio's body to his grateful father, who had little difficulty in reviving his wayward offspring. Shortly afterwards, however, it became apparent that Blue had allowed himself to be captured in order to discover the true identity of the Adversary. Escaping with ease, he attempted to kill Geppetto, but failed due to the sheer number of protective spells that surrounded the older Fable. Angrily, Geppetto swore to send the Snow Queen after Blue to get revenge. Disturbed and confused, Pinocchio chose to stay with his father when Blue left.
His anger with Fabletown grew even further after their next encounter. Bigby Wolf infiltrated the Homelands and broke into Geppetto's cottage, where he explained that Fabletown would be adopting what he referred to as the Israel template. Any hurt inflicted on Fabletown would be returned several times over. Bigby then demonstrated this policy by using plastic explosive to destroy the grove of magical trees that Geppetto used to create the wooden soldiers, in retaliation for their assault on Fabletown. The resulting fire also destroyed Geppetto's cottage.
After these events, Geppetto finally decided that Fabletown had to be dealt with, and called a conference of the Imperial elite to discuss possible options. Although the final discussions at the conference are yet to be revealed, he seems to have decided to wage all-out war on the mundane world, possibly to ultimately use the devastated world as a prison. He has dispatched Hansel to Fabletown, ostensibly as an official envoy, but really with the mission of retrieving Baba Yaga and the surviving wooden soldiers and return them to the Homelands. As a result of Pinocchio's report on the likely retaliation from the mundane world, Geppetto has decided that all the Fables in the mundane world will have to be assassinated prior to their attack, in order to prevent them from informing the mundane authorities of the source of the invasion and rallying them against the Empire. He has ordered the Snow Queen to make the necessary plans and to contact Hansel to impress on him the urgency of his mission. Geppetto intends the attack to take place in three years time.
As the true power behind the empire, Geppetto has enormous power in the Homelands, even if that fact remains unrecognised by the vast majority of its citizens. To all intents and purposes his will is absolute within the borders of the empire. He has a huge military force at his disposal, along with considerable magical resources.
He remains a talented woodcarver and continued to make new children at a rate that he estimated to be around twenty per year. With the recent destruction of the magic grove that provided the wood and Flycatcher's recent acquisition of the grove's power, however, this is no longer possible.