Rocky is the younger brother of Rusty, who is Lincoln's classmate. Rocky is also one of Lucy's love interests, since Lucy was also interested in a boy named Silas in the episode "L is for Love".
Rocky appears to be a rather quiet kid, with an interest in video games and sports. Despite his indifferent demeanor, he seems to be polite and nice, given his friendly interactions with Lincoln. In contrast to his rather "normal" personality, Rocky also appears to have a liking to the macabre, given his immediate fascination with Lucy. However, he thought she's too cool for him so he avoided her.