Ferb Robotnik

Ferb Robotnik is Ivo Robotnik's beloved nephew or son. He is a bookworm boy with bionic legs which act as grappling hooks and jumper gadgets. He has a fierce rivalry with Amy Hedgehog.

Early Life
Even though he is a Robotnik, Ferb had an unnatural love for books, animals and he was also generally kind-hearted. is uncle, Ivo, saw this as potentially bad. So he replaced Ferb's legs with bionic steel fists so that he would be unable to wander and happily make his joyful dances over the green fields. He then sent Ferb to his old school, Madame Amberly's Academy of Evil to become wicked, hoping that he would become just as evil as him.

Sonic Twinsanity
In Sonic Twinsanity, Sonic and Robotnik arrive at the Academy of Evil to look for Ferb as they need him to repair the Psychictron. After searching various classrooms and hallways, Robotnik finds him in his dormitory. He pranks his uncle by using a fake head and jumping out at Ivo. He shows his uncle what he's learned, battles the Geometrics and briefly gets pursued by a school bus which Sonic tied to Robotnik's airship.

Sonic, Robotnik and Ferb go back to the Iceberg Lab, where he fixes the Psychictron by giving it a good smack, to Robotnik's surprise. The team then head into the Tenth Dimension. Ferb is then kidnapped by the wild Evil Sonic, the alternate counterpart of Sonic, and he takes Ferb to his house, where Robotnik soon rescues him by foolishly offering himself to Evil Sonic. He later helps in defeating the Evil Twins by destroying the power sources of their Deathbot. His voice is briefly heard in the ending.

Trivia

 * Ferb does not speak much, but has few quotes through all games in which he appears, where he is always voiced by Thomas Brodie-Sangster.
 * Robotnik almost called him his daughter in Sonic Twinsanity but he corrected himself and said nephew. This may show that Ferb is actually Robotnik's daughter.
 * Ferb is taller than his uncle, Chester V and Doofensmhmirtz and the same size as Sonic.