- For other uses of the term, see Chuck.
Chuck is a character in Sonic Underground. He is an anthropomorphic hedgehog and the adoptive uncle of Sonic the Hedgehog. He was a high-ranking member of the Resistance stationed in Robotropolis until he was captured by Dr. Robotnik's forces and roboticized.
Chuck is a humanoid hedgehog with blue gray fur and black eyes. He also has thick, pale blue eyebrows and a similar mustache. For attire, he wears white gloves and brick-red shoes with three yellow straps.
In his roboticized form, Chuck's fur has turn dark gray and the left side of his face, along with everything else below his head, has been covered in light beige metal armor. His left eye also appears to be cybernetic, but his right eye remains untouched.
At some point during Dr. Robotnik's tyranny, Chuck became a Freedom Fighter and served as a major member in the resistance against Robotnik. Following the arrest of Sonic's foster parents and the destruction of Sonic's home, Chuck found Sonic crying in front of his burning house and assured him everything would be fine.
Over the next years, Chuck raised Sonic and got him into the resistance, working with him on the destruction of many Swatbot factories. After having worked together with Sonic for a year, Chuck had his nephew go on a mission to destroy a prototype force field that Robotnik had developed for his factories, though he insisted Sonic was careful of not being seen or Robotnik would make him a constant target. Though Chuck assure Sonic that he did not have to do the mission, Sonic insisted on completing his task and destroyed both the force field and Robotnik's factory. After Sonic returned home, having overexerted himself, Chuck told his sleeping nephew how proud he was of him before heading out to find a doctor for him.
After Sonic had left to find his siblings, Manic and Sonia, Chuck was found and arrested by Swatbots due to his connection to Sonic. Chuck was then roboticized and turned into one of Robotnik's slaves.
Chuck is a warmhearted person who deeply cares for his family, crying in joy of Sonic's safe return from their last mission together, and is always willing to offer comfort. He is usually mild-mannered and cheerful, but is well aware of the life-threatening risks that a Freedom Fighter must face. As such, he will not risk Sonic's life, and is will offer Sonic to back out of his missions, despite of the consequence that might follow. He also has trouble grasping the concepts of slangs.