Rocky is a small anthropomorphic rock who is quite bizarre and erratic. He is usually seen as an obstacle by most people, given his lack of intelligence and his tendency to barf constantly. Yes, Rocky likes to barf because his vomit occasionally helps him and his teammates, but it usually flies on other people's faces or their property.  He's usually seen smiling and is rarely shown to be angry, even when bad things happen to him. This implies that Rocky is typically in a carefree and cheerful mood. However, it could also mean that he doesn't understand things due to a lack of intelligence, or something far more sinister remains to be seen. These tendencies can make him seem quite childish. Rocky is chaotic and child-like, often showing no understanding of objectives or plans and barfing on a whim rather than for a purpose.