Humpty is a short, egg-shaped robot. His head, arms and feet are short and lime colored, while his torso is yellow. His head also features two antenna, what appears to be two ears, and a bandage. On his back, he also has what appears to be a thruster.
In the Adventures of Sonic the Hedgehog television series, Humpty's appearance is largely the same, except that his torso is dark green and green instead of yellow.
In the recent past, Dr. Robotnik gathered many of his old bounty hunter Badniks, including two Humpties. The doctor told them that he wanted them to catch Sonic, and if they did, he would give them one billion Mobiums. Immediately afterward, all the Badniks headed out in an attempt to catch the hedgehog when he revealed himself. The Humpties tried to catch Sonic, but they ended up being destroyed by the hedgehog.
Another Humpty was later seen gathering scrap for Dr. Robotnik, along with several other Badniks.
Dr. Robotnik's Mean Bean Machine
In the 16-bit and 8-bit versions of Dr. Robotnik's Mean Bean Machine, Dr. Robotnik assembled many of his old bounty hunter Badniks, including Humpty, and told them to kidnap the Beans that inhabited Beanville so he could turn them into robot slaves using his Mean Bean-Steaming Machine. Later, Humpty was the third Badnik Has Bean battled and defeated.
Due to his body, Humpty is very clumsy. He struggles to keep his balance, and does not like people who can maintain their balance naturally. He is also a very violent robot, who carries out his leader's orders without question. As a bounty hunter, he also loves money, and will do whatever he can in order to earn tons of Mobiums.
- Humpty's name is based on the nursery rhyme character Humpty Dumpty, who is usually portrayed as an egg.
- In Dr. Robotnik's Mean Bean Machine, Humpty has the same AI as Sukiyapodes from Puyo Puyo, the game on which Dr. Robotnik's Mean Bean Machine is based.
- In "Sonic Christmas Blast", several Badniks that resemble Humpty appear.