Caboose seems to act very childish as his understanding of the world and actions are incorrect and shows a great amount of curiosity. However, Caboose does show a lot of care to many characters, even to the Reds, despite them being rivals. He often tries to impress others in order to gain their respect, although it often backfires in some way. Caboose shows a great amount of loyalty as well, as shown when he kept trying to resurrect Church through Epsilon. Because of his mentality, Caboose easily becomes hurt if insulted, such as in Change of Plans, and is easily abused, such as when he was tricked to shake the Alien's "other arm". Overall, Caboose may act like a child, but is very loyal and brave when the situation calls for it. He's also incessantly cheerful; always expressing enthusiasm and adopting an optimistic mentality on missions and in the face of danger. Upon passing through the Construct portal, Santa describes him as never having a negative attitude. He does show that when he feels lonely he can become highly obsessive and secretive; such as the events in Relocation and his discovery of Freckles.