Billy

Billy is a friend of Franny K. Stein who appears in The Invisible Fran, the third book in the Franny K. Stein book series.

Personality
Billy is very amiable and enjoys baking cookies.

History
Billy made cookies for his class on Hobby Day, which didn't make Franny very happy.

When Franny tried to get volunteers to help her with her Two-Headed Robot, Billy raised his hand, but was only interested in teaching the robot to bake pretty, pretty cookies after the robot was finished.

After the two-headed robot was destroyed by Erin, Lawrence and Phil, Franny had the remains of the robot used to make an oven, then invited Billy over to bake cookies, which were eaten by Igor.