Benjamin Franklin is one of the signers of the Declaration of Independence, and former Godchild of Cosmo and Wanda.
Benjamin Franklin is an inventor and also one of the people present for the signing of the Declaration of Independence. He seems to be interested in harnessing the power of electricity, even in his youth, unlike the real Benjamin Franklin that discovered it as an adult.
In Twistory, Benjamin Franklin, along with the other Founding Fathers were all wished by Timmy from the past to help him on his book report. This wish caused the timeline to change where the United States loses the American Revolution and still part of the British Empire, which was the result of Benedict Arnold posing as Washington. The Founding Fathers all band together to help Timmy restore time.
In The Past and the Furious, Bejnamin (as a child) was seen flying a kite in the middle of a thunderstorm. Cosmo revealed this was because he told him to "go fly a kite." Later on, while they were alone, Timmy pushes Ben out of the way of lightning coming towards him, making him come to the conclusion that lightning is a dangerous energy source. He decides to get electricity in a safer way, and ends up deciding on using potatoes. In the changed future, towns get their electricity from a giant Potato in the centre of town.
He is later seen in the climax of the episode, along with Timmy and the pther past godchildren, coming together to stop Megan Bacon from destroying Fairy World. He uses a flashlight to blind her eyes momentarily.