Robot

Robot is a blue educational robot toy that appeared in the Toy Story series. He is shown to be good friends with Snake, as they're always seen together. Robot is also known to be good with building blocks. He and Snake appear to be acquainted if not friends with Mr. Potato Head, Hamm, Rex, and Slinky, as they are usually seen sitting with them during meetings and sharing space to sleep on the bookshelf.

Toy Story
In Toy Story, Robot and Snake are called by Woody for podium duty for a staff meeting. Once Buzz Lightyear arrives in Andy's room, Robot, like most of Andy's toys, takes a liking to him. During the Strange Things sequence, when all the toys are working out, Robot stands on his head to let Buzz run on his treads like a treadmill. Robot also helps Buzz repair his ship.

Toy Story 2
Robot later appeared in Toy Story 2 when Buster comes into Andy's room, during the yard sale roll call, watching the re-enactment of Woody's kidnapping, and later watching Wheezy sing You've Got a Friend in Me.

Toy Story 3
Robot makes an appearance in the home videos that Mrs. Davis took of Andy when he was a kid. Back in the present, he is no longer with Andy's toys, and it's explained by Woody that he was sold at a yard sale.

Trivia

 * Robot has some notable similarities to WALL•E, particularly his robotic arms and treads.
 * In the Christmas ending from the Toy Story Animated StoryBook game, clicking on Robot will make him do an imitation of the robot from Lost in Space.
 * Robot has only one spoken line in Toy Story.
 * Robot's mouth lights up when he talks similarly to Emperor Zurg.
 * Both Robot and Snake have been known to be the most popular background characters. Many fans have requested a real toy version of Robot to be made.