Caboose

Caboose can be considered as, by far, the most unintelligent character in the series, although at first this wasn't noticeable. In Season 1, Caboose was dim-witted and less eccentric than he was in later seasons, where he then later showed near detachment from reality. In the course of the series, he has been repeatedly subjected to mental trauma and physical brain damage, which is visible in the downward spiral of his behavior. Because of his intelligence and unusual behavior, he acts very childish: treating serious situations like a game, envious for not being favored at some points, and having illogical reasons for his actions, which frequently earns him the scorn and disrespect of the series' other characters.

Despite this, many characters show care for him, including the Reds, who he treats as neighbors instead of enemies. Caboose always tries to impress Church and help him as well, stating that they are best friends, despite the fact Church is constantly annoyed by him. Partially due to positive early fan reaction, Burnie Burns, the main writer for the series, focused the storyline on Caboose and Donut (Dan Godwin), the Red Team's rookie. The staff later made Caboose less intelligent to add more humor in series. Later on Caboose, arguably, became the most iconic character of Red vs. Blue.